Tips for single-family house floor plans

That is your main problem. Louvers in the glass are not much better than internal shading

Yes, we would also prefer roller shutters. Unfortunately, there was no choice since it was a purchase from the developer and the homeowners' association. Everything will be better with the next house. That’s why I wonder what the difference would be with roller shutters and, in the best case, additional shading by an awning or something similar. Then you would probably notice the cooling effect more.

That's true, residual spaces do occur. But we have given some thought to how we could use them

However, the residual spaces do not arise inevitably or as a given - not even in connection with the setback story. Rather, they mainly arise due to your lack of planning experience (and then, of course, somewhat reinforced by the connection with the setback story). The basic idea, "there is always something standing around, so every room could use an auxiliary storage room," is correct but quaint. Other people feel the same way, yet the evolution of building culture has not so far produced the result that we scatter our storage rooms all over the house—except in the form of closets in many rooms. In other words: no matter how kindly one may think positively about your fractal little storage rooms, they are ultimately leftover spaces, and experienced planners can solve that more skillfully.