Bus systems - wiring, planning, etc.?

Enlighten us why. That's how it is. Cables and statically positioned users belong together - the assignment applies in both directions! Wireless makes sense wherever devices or users are mobile or nomadic, but a roller shutter motor is always fixed in the same box. "Wireless cables" are the most expensive in every respect: complex to plan, difficult to control quality-wise - actually only popular among admins who can't handle LSA tools

"Nomadic" I find awesome xD

As you correctly recognized, for me it’s about "mobile" devices. And the reason to do everything as cable-free as possible is simply that the layout of the rooms will very likely change very quickly. I have never managed to position every table etc. exactly right on the first try in an apartment. Where do I want my desk later? Because the socket has to be there. On which wall will the TV really go? Will one perhaps ever be placed in the children's rooms? If so, there has to be a LAN socket in the right place there. Or if a room is supposed to serve a new purpose sometime. For example, a third child arrives somewhat unexpectedly. Oops, the room now needs different connections than before, when it was the storage closet. Or you just use WLAN. Then you only need power. It’s about flexibility over the years for me. And a star-shaped cable network is of course the most impractical for that. That is only practical for really clear things like shutters, door/window sensors, or the like. I would even find the control unit more practical via WLAN. Simply because then you might be able to install an additional one somewhere. I think you already understand what I mean. With all planning, something always turns out differently. And then you stand there awkwardly if the installed system is too "inflexible". And for that I would include breaking open walls and laying cables throughout the whole house.

I can understand you well and what it is about for you. I am the same way. Not regarding WLAN (I am indifferent there) but regarding the flexibility of the electrical installation over years and decades, and precisely for that reason I decided on KNX. Especially because it is infinitely flexible with proper planning. You are simply stuck in the IT mindset.

And a star-shaped cable network is of course the most impractical for that.

CAT yes. Bus no.

I would even find the control unit more practical via WLAN. Simply because then you might be able to put an additional one somewhere.

Yes, that is always possible with KNX. At any location. Why "the control unit"? Central and dedicated controls are things of the past.

No matter how much you plan, something different always comes up. And then you stand there awkwardly if the installed system is too "inflexible."

That is precisely why buses were invented at all, because you always wanted/had to change something.

And I would count knocking open walls and laying cables throughout the entire house in that.

But that does not apply to new buildings. You simply plan ahead and well.

I also think that this has little to do with IT in the classical sense. One thing is data exchange. Mobile devices need Wi-Fi, that's clear. But stationary devices (servers, printers, computers, access points, consoles, video/audio receivers, set-top boxes, blah blah blah) need an interference-free connection. And honestly, a normal house is very much planned with consideration of where a TV will be. Normally, a TV will move at most to the adjacent wall during the lifetime of a house. Possibly to the opposite one. But WTF, then I'll just lay a cable right there. It costs "nothing," but makes me maximally flexible. Have you ever noticed the difference between browsing photos on a NAS on a mobile phone or on a device connected by cable (Gbit)? There are worlds of difference. And data rates will generally continue to increase. Really high data rates in wireless on the consumer level only work at a distance of 1-2 meters at most.

"I think 'nomadic' is awesome xD"

Nomadic means, for example, using a laptop at the dining table and clearing it away for dinner, then taking it onto your lap on the couch, and the next day the weather is too nice so you work on the terrace. Always sitting, for hours in the same spot, just not while walking through the house – that is the difference to "mobile". Fixed for hours and thus constant within the area of the same access point cell, but also always only a cable length away from the next wall socket. With a tablet the user's switching frequency between breakfast bar, kitchen island, sewing room, armchair etc. is already different, that is more "mobile" – there is much more roaming involved, the place may even change within a session. Whoever urgently feels the need to call me even while taking a dump, please do not use Skype but GSM – WLAN has nothing to do with that.

And data rates will rather increase in all respects. Really high data rates in radio at consumer level work at a maximum of 1-2m distance.

One should also realize that Super High Definition Multimedia practically means "microwave". More data rate, higher frequency (= more waves that can be destroyed by interference) means then again even more data rate, so that the buffer does not have to wait critically long for the retransmission of packet loss.

Normally, a TV will change walls at most once during the lifetime of a house. Possibly to the opposite one as well.

That’s why I always find it amusing when people here want to adapt their house to the centimeter-precisely balanced current couch-TV setup.

The socket positions won't fit any better after a change of use than LAN ports.... TV suddenly on another wall? If you want to be completely flexible, install a raised floor (like e.g. in server rooms). There you can adjust power and everything else at any time...