Electroinstallation too expensive - oversized or too expensive?

If you use cheap stuff, that can definitely happen.

Dusting should also be mandatory for these parts.

It definitely wasn't cheap stuff. I don't know of any normal power strip that is oriented upwards and protected against that (not in the under 40 Euro range). Dusting is somewhat insufficient, and who does that thoroughly (children rather not), especially if you have everything full of it (especially under the bed, desk, etc. are vulnerable areas).

That's why I also mount something like this under the desk or on the wall and don't just throw something like this into the corner.

Well, with the effort and costs involved, you can definitely have better ones installed in the wall; if the electrician doesn't rip you off, it's not that expensive. That's what it's all about. Even though I also securely install mine (e.g., one with a relay on the PC that independently switches everything on/off), I don't think many people do it that way.

There are enough GUs who take Schweinemoos for that - therefore, in this case, I would definitely think about how many I would allow myself. In my case, only a power strip in the living room is planned.

The fact that most electricians install a 16A circuit breaker no matter what is connected at the back does not mean that this is correct, especially in a single-family house... usually the saying is "we've always done it this way"... that's what I meant from a safety perspective...

There are other factors such as the type of installation, length of the cable, etc.

The 3600 watts do not always apply... sometimes it stops at 3000 or even less...

If the circuits are properly distributed, they can also be connected to one phase without any problem.

Safety is also an argument, because especially multiple sockets lying around somewhere can quickly become filthy or get moisture, especially in the children's room. I once saw one smoldering. It certainly would have caught fire without a fuse blowing. Fortunately, I noticed it.

If an outlet or device has a problem, the RCD trips, or something is wrong... I also don't understand why some people still install 3 x 1.5 cables to the sockets; for me, sockets require 3 x 2.5 PERIOD