I didn't care when Rome was lost. I did when its huge cathedral was knocked down though. Hans had it built after all
You make very good points regarding those factors, in terms of ownership and complexity of levy.

Regarding the levy, putting those units as first few in the stack doesn't mean it is easy to discern them at the end of battle. Any unit that was lost completely in the battle and is healed up afterwards will appear at the end of the stack after the battle. If you lose several units, then you cannot be sure which is which. You could of course say that you can keep track of it via in-battle screenshots, but these are also not always accurate as regrouping units can shift their positions. Thus, its incredibly difficult to mark them.

Still, they are a good idea, and I think they should be subject to your own time constraints and will rather than being forced upon you. So if you decide that feudal levies are taking too much of your time, we can just abandon the idea and go with the units left of the levy but no longer replace them.