Central controlled residential ventilation with heat recovery: Are rooms individually controllable?

Hello community,
while searching for experiences on the internet about central systems for controlled residential ventilation ([Controlled-Residential-Ventilation]) with heat recovery ([Heat-Recovery]), something occurred to me: no one seems to build systems where the ventilation of the rooms can be individually and reasonably comfortably controlled (not just once for balancing but permanently, daily). I find neither experience reports nor are such systems advertised.

Why do I want something like this? - A central [Controlled-Residential-Ventilation] with [Heat-Recovery] equalizes the temperature of all connected rooms over time. (Air is drawn from all rooms, mixed, passed through the heat exchanger; warmed fresh air reaches every room.) But that is not always desired. At night, I want to sleep in a cold room, yet still use the [Controlled-Residential-Ventilation] to be able to sleep with closed window/door. However, I do not want/cannot cool down the living room every evening - heated by underfloor heating. If I could switch off the ventilation in the living room at night, and at least temporarily switch off ventilation in the bedroom during the day, the problem would be solved.

Would that be difficult? - Air flaps in all pipes from the star distributor into the rooms, connected with insanely expensive actuators or simple cheap servos from the model building sector could regulate airflow. Behind that, you would probably need silencers (?). Between the fan and the first central distributor, you could place a pressure sensor to control the fan steplessly. If the air pressure before the control flaps is kept constant, adjusting one flap should not greatly affect the airflow through another.

As I see it, this would be a huge advantage with reasonable extra effort. Why does no one do that? I am still quite a beginner in this field. Have I overlooked something?
Thanks!

The whole thing is accompanied by a high effort = high costs. How "cold" does your bedroom need to be? Since the whole house is ventilated and you also have air exchange through the doors (or frames, depending on your preference), the temperature will always equalize throughout the house again and again. What you can of course easily do - without pimping the system - is, for example, to choose a timer program. For example, that the system is off from 11 pm to midnight and you thereby have the possibility to fall asleep in the cold bedroom ==> open the windows wide beforehand.

The heat distribution through the ventilation system is only a small part of the problem. The heat also transfers through the walls and doors into the bedroom, provided they are not insulated. Therefore, the benefit is likely to be rather small compared to the effort...

Constant current system is the magic word - then controllers in front of the rooms.

But for the reasons mentioned above rather expensive & pointless.

There are already central controlled residential ventilation systems with multi-zone control, where in summer, for example, the bedroom ventilation is brought into the house via a bypass so that it is not further heated.

The bypass is overrated - useful yes, but it doesn't really cool anything down. The walls store too much for that...

As I said, a lot of money for nothing...