How to clean the Geberit wall drain shower in case of clogging?

I suspect that in hotels the floor structure is much thicker, so you can first install a larger fall before it possibly goes into a branch. Also, ventilation is often done carelessly. That’s this Tetra Pak effect. When you cut open a Tetra Pak and pour it into a glass, it gurgles and the flow "chokes." It’s very easy to fix by poking a hole on the opposite side. Then the water just flows smoothly into the glass. Familiar. The same thing happens with sanitary drains as well. However, if the ventilation is undersized, too far away, or worst case completely omitted, it also "gurgles" in the drain, causing the water sometimes to even come back at you. But this actually has nothing to do with the type of drain. My criticism of the wall drain is that it is simply much harder to reach if you ever have to access it. Cleaning the hair strainer is something you basically always have to do regularly, at least if at least one user of the shower has longer hair. With the wall drain, however, it’s a real hassle. You can remove and put back the insert from the floor drain reasonably well, right? If there is a clog, you might still be able to get a drain snake into the wall drain. Plungers or anything else are useless there; either you need an inspection hatch above it (not a good idea in the shower) or you have to open the whole wall. Geberit has by now become for me a synonym for what happens to quality when a large market power arises for whatever reason. But I also don’t know if there are inexpensive and good alternatives. My plumber said that with floor drains there really aren’t any sensible alternatives.

The insert from the floor drain can be taken out and put back in reasonably well, right?

I'd call it mediocre, I always have to use a knife in the slot to pry the grate out. It's just annoying...

A stupid question, does the hair strainer actually serve a useful purpose for the entire drain, or is it basically just a catch net to, for example, catch lost earrings before they lie forever somewhere in the sewage system, and the hair inside is the necessary sacrifice to prevent that?

No, it’s not called a hair sieve for nothing. You wouldn’t believe the disgusting soap-hair clogs that can form at narrow spots if you let everything go in there. At least the 40-50mm HT pipes are still too sensitive to blockages. Once you’re in DN 100, I’d personally consider the risk low, at least if there’s regular flow.

Thanks! So I have to check if we can somehow get an Ø100mm pipe into the shower :D... Seriously, it only makes sense as a shower drain if the whole house gets the 100, right?

Shower drain at 100 is not possible as far as I know. The trap still has to be attached there. Just try to have a downpipe very close to the shower drain and as few bends as possible. Later, make sure that the venting is close and large enough. Or simply show interest early on, then they work with a buffer...

Probably a more difficult task, but I am now definitely prepared to ask the right questions ;). Thank you for your answers to my layman questions...