Tiled shower floor - sooner or later trouble due to silicone joint?

that is not well planned :(

In what way? Because of the extension or the storage on the floor? It can’t be done differently since the apartment was already in the shell stage and the riser shaft is here. The shower was actually the toilet, so even more wasted space. Of course, this segmentation also bothers me, but that’s where the door will go.

with us, the expert specifically removed the seal before the tiles were laid.

Wrong shower tray.

Wrong shower tray.

And further? I don't think you can easily find a shower tray with the dimensions 103-105*100. The solution would clearly be tiles.

you should have installed the drywall partition so that it aligns with the shower tray ;) You can also see that on your plan.

I know some who have underfloor heating specifically under the tiled shower (to have warmer feet while showering),

...so that the water dries off better :)

Just take tiles in "lime color" - done :p

Well, try telling that to the general public who absolutely had to see anthracite as their new color... back then ;)

While I have already renewed many other silicone joints in the house because they were cracked, this joint is still fine.

Same with us: shower was intact, all others cracked. But that might also be because of the separate screed?