House wiring LAN/SAT

I don't understand what could be wrong with SAT-IP and why people insist on needing a receiver for it.
Our TVs (from 2011 and 2012) both have a so-called DLNA client built in. With that, you can stream content from DLNA servers (Fritzbox, NAS systems, PCs, etc.). We have now bought a SAT-IP server from Triax (TSS 400) and the Amazon reviews are divided even there, but what I want to get at is this:
It distributes the signal via DLNA, so any DLNA client can play it back – including our TVs. Smartphones, tablets, Blu-ray players, PS3, ... can usually do that anyway. Of course, you can still connect a corresponding receiver in between, but why?
If I want to record something, I use a dedicated computer, or in my case the already existing Synology NAS with the free TVHeadend software, and then I can record all sorts of things (also timer-controlled).
Our dish is not coming until this Wednesday, but the Triax is already here. I can report my experiences over the weekend.

I have read, Sky does not work at all with Sat-IP!?

DLNA is more of a makeshift solution. Yes, with a DLNA client you can transmit video and audio, if the SatIP server has also implemented DLNA. Everything that comes after that is luck or even definitely doesn’t work. Forget channel lists, fast zapping, EPG, possibly subtitles, audio selection ...

Encrypted signals are not a problem. The receiver obviously needs CI+ or something similar. What does not work is central decryption on the server.

The thing with EPG, etc. is of course true. I am placing my hopes on TVHeadend, which at least can handle EPG. I don't know about subtitles, but I haven't had them in nearly 30 years of cable TV so far and therefore haven't missed them.

I have LAN in every room and Coax in every room (a total of 7), excluding only the bathrooms and utility room. For the living room, I got myself a 5-port switch, somehow technology hardly works unplugged these days...

I can't recommend WiFi without a repeater in the new building, our impact sound insulation could just as well be a tin foil hat...

Much more annoying than the wiring is the castration of HD+ by the private channels... What am I supposed to do with timeshift if I can only rewind but not fast forward? For me, the SD channels are back in the favorites. By now, practically every receiver with 2 tuners can record and send with just one cable. (Even the Sat 500 box from T Com)

Please plan Access Points instead of repeaters.