Non-load-bearing interior walls - What type of construction?

Especially that non-load-bearing walls are even important for bracing

Only some of them – but which ones, you can’t just quickly tell from the floor plan.

and that the whole thing has to be discussed with the architect!

The architect is not just a little house painter and stamp collector, but your comprehensive planning partner. You should talk to him as openly as you do with your hairdresser.