Drainage in front of garage door is missing / correct it? Defect?

Yes, planning error. Where would the problem be to install a channel and drain it with a pipe? If necessary, into a soakaway?

Either way, this is definitely a big mess.

But whining is not worth it anyway. A channel with a pipe in gravel packing or something similar should cost 200-300€.

but it doesn't help

The landscaper said they would remove the rearmost stone in front of the door threshold and put in a drainage layer or something similar there? We have only briefly discussed it so far because he said I should first declare it as a defect.

Exactly! The "funnel" needs to be mitigated (heavy rain or so) and a small drainage layer (soakaway) is the quickest and most cost-effective option. And just by the way, if something doesn't work, it is a defect, as in this case. And that without emotion