Why Home app does not allow to set which device to be the active Homekit hub?

In a setup of a large house with 7 apple tvs and 12 homepods and many homekit devices that connect by bluetooth the fact that the homekit hub is roaming randomly is breaking the connection to these devices. Apple tvs can be set to not connect as a home hub but one by one using their remotes, so some footwork is involved. Alas homepods cannot be set to stop connecting as home hubs. The only way around that I found is to not connect the homepods to the cloud account, but to a different one. This solves the roaming homekit hub problem but limits the functionalities of the home pods. Ideally if home app would allow to controll which device is the Homekit Hub these problems would be easily solved even when far away from home. Also as from time to time apple tv tend to get stuck and need a hard reset, it would easy to switch to another apple tv through the Home app and remotely solve any issues with Homekit not working.