Window reveal before window installation... smooth coat?

of 10 shell constructions here, 10 pieces had it.

With flexible adhesive or similar, it's done quickly, so why is such a fuss being made and it's not simply implemented?

so...asked again.
This will be done for an additional charge.
This amounts to approx. €400

I would never pay that in my life.

I would never pay that in my life.

Alternative? a) do it yourself and thus void the warranty b) stop construction, expert, ...

There is indeed a smooth finish, even if it looks untidy. In my opinion, it should also be continued on the outside to be able to stick the outer foil flat.

Directly put it on the "anti Poroton" list

The warranty for the complete shell construction?

I wanted to go to the hardware store right away and buy ready-made [Flex].
Because I can't sleep very well because of it ☝️.

Earlier I spoke again with the construction manager on the phone and he believes that it is okay and that this would be a smooth finish, but with the exception that it could be a bit cleaner.
I then just said that it should be improved.
Tomorrow is supposed to be the acceptance for the shell construction, it will be addressed again then.