How should stair spotlights be switched on?

Yes, and? I'm not saying that using motion detectors is wrong – unlike you, who wants to start another half crusade.

I'm just saying that not everyone needs it everywhere – because light is not always desired. Completely according to personal taste – with you, it sounds more like you absolutely need it that way. And yes, there are also builders who did not plan the staircase as a dark hole – then you simply don't need automatic constant lighting.

And I simply don’t have a switch... neither in the hallway nor on the stairs nor in the foyer... of course it’s a matter of taste...But true to your statement: No matter where you step, a light in that area will illuminate you

That’s not what you want. Maybe you want to see, for example, who is at the door or look from the upper floor into the garden. That light triggered by sensors is rubbish.

Why? The light is already on when you enter the room. And what business does the guest have with unknown tablets? (If you even have such things in the house.)

The guest wants to roll down the shutter at the back left and dim the light in the middle a little brighter. So he has to take the KNX tablet and start experimenting. Well, he will fail at that.

And the resulting disadvantages were then also described, which are then consistently ignored. Let go of the thought that everyone wants automation everywhere – and also that the person probably doesn't know what's good for them. I agree with you on many things, but some things just don't fit – and I'm no exception.

What do you see differently? That there is never, ever a situation where I would want the light in the hallway to be off? There are surely many.

Or that you also have to familiarize guests like grandparents who are currently babysitting with the complete technology?

And you always have to be able to override it manually, so you need all the switches, for example, in the living room anyway. Or you can only control blinds and lights via app? But then the grandparents have to be instructed, for example.

Well, I see that differently... I have only presented my experiences and shown what the advantages of the PMs / motion detectors are in those areas.

You don’t want that. Maybe you want to see, for example, who is standing in front of the door or look from the upper floor into the garden. That is sensor-controlled lighting nonsense.

If you want to do that, it can also be done with PMs; you just need a bit of creativity in programming.

Guest would like to lower the shutter at the back left and dim the light in the middle a bit brighter. So he has to take the KNX tablet and start experimenting. Well, he will fail at that.

Why fail? Because he can’t recognize pictograms or can’t read?

You think it’s easier in a conventionally wired house? What does the guest do in such a case? No bus, everything conventional, a usual installation in a new build nowadays:

I have already dealt a lot with KNX, but still don't see the point. I would like to be convinced. Is it really the 0.6 seconds it takes to turn on the light switch?

As I said, it doesn't work without a switch, after all, you sometimes want to override and not just move lights and blinds according to fixed scenarios...