When a family has shared instance parameters, I can see and adjust them in the properties bar when I select the family. I would expect it only shows me shared parameters of the selected family.
But Revit shows me ALL shared parameters of the same category (e.g. mechanical equipment). I have a thread about this. So for example, if I select a fan, the properties bar shows me the instance shared parameter of that fan, but also the ones for all boilers, AHU, radiators etc. This creates a very busy properties bar. Those shared parameters (that don't exist in the selected family) also can be edited, which leads to even more confusion.
So please, only show the shared instance parameters of the selected family.
When a family has shared instance parameters, I can see and adjust them in the properties bar when I select the family. I would expect it only shows me shared parameters of the selected family. I had a thread about this here.