I gather that administratively you are cooperative and can imagine tailoring the development plan of the future MI or MD so that your planned facts can still be incorporated. However, it might be possible for me—at the very least for —to predict much more concretely if you post a cadastral excerpt showing the current situation.
I never spoke of a walk-in closet; the estimated 2.70 m bedroom depth is not the only thing that makes me a bit anxious about injuring someone when I swing open the tape measure. You can only converse with Germans here at the dining table; there’s no room for Italian gestural accompaniment. You can certainly be economical with every piece of furniture individually, but overall, every length and width also needs some “with cream,” otherwise it gets tight. From my perspective as a former severely disabled civil servant, this house has movement spaces “without spastic surcharge” in every nook and cranny. You have to walk very carefully everywhere; the children are not allowed to become hyperactive in the layout structurally. Basically, I don’t want to demonize space-saving, but: if you (still) believe you can downsize now, then test it out in practice and tape off restricted areas in your current apartment with masking tape where you think less space would also be enough.