Roof drainage into the gutter or over a drip edge

We have a flat 23-degree gable roof with drainage via a drip flashing. That means the underlayment drains over a drip flashing and everything flows over the roof tiles into the gutter. It is a cold roof.

1. How problematic is it if a photovoltaic system is installed later? Water that gets onto the underlayment through the connections/roof tiles.
2. How problematic is it for the facade, since the water drips off uncontrollably? Condensation and sweating water or snow masses in winter that come through the roof tiles and are blown against the facade by the wind. (2 full stories)
3. Are there negative experiences regarding a terrace – meaning water from the drip flashing frequently running onto the facade?
4. Should you generally drain into the gutter from a certain roof size since automatically more water accumulates?
5. Am I worrying too much?

The used roof tile has a standard pitch of 22 degrees.

Does the drip flashing have to be explicitly listed in the construction and performance description? The general contractor just did it, and I would have wished to be asked beforehand.

Does the eaves flashing have to be explicitly listed in the construction and service description? The general contractor just did it like that, and I would have wished to be asked beforehand.

We already discussed this topic the other day, see here: https://www.hausbau-forum.de/threads/ist-ein-traufblech-zwingend-vorgeschrieben.46839/

This topic has already been discussed recently, see here: https://www.hausbau-forum.de/threads/ist-ein-traufblech-zwingend-vorgeschrieben.46839/

Yes, I have read the post.

We are talking about the problems that arise with drainage via a gutter flashing and if it is not listed in the construction specification whether then drainage should actually necessarily be done via the gutter during house construction.

Is it to be expected that large amounts of rainwater must be drained below the planned roof drainage, the rainproof additional measure must be drained directly into the rain gutter. Are there regulations specifying when drainage into the gutter is mandatory? In other words, when is it to be expected that large amounts of rainwater will occur? For example, roof size, location of the house / weather conditions in the area, specification by the architect.

the rainproof
additional measure must be drained directly into the
gutter."

How one is supposed to drain a measure, I cannot even follow linguistically. Apparently, they did not wait with the beers until after the municipal council meeting.

How one is supposed to drain a measure, I just can’t follow linguistically. Apparently, they didn’t wait with the beers until after the municipal council meeting.

The counter-batten membrane (USB) is a special additional measure for rainproofing under roof coverings. Clear now?