Having individual sheets devoted to PC's, NPC's, Monsters, Vehicles, Cities, etc would be very helpful to have. And just the prospect of having to maintain a single sheet which incorporates each of these different things can be cumbersome. Also playing a game (like Pathfinder) which has multiple popular 3rd Party systems (Spheres of Power/Might, Path of War, Psionics, Akashik Mysteries) it would be useful to have individual character sheets catered to each individual system. I also have played games where a D&D 3.5 character adventured alongside a party of D20 Modern characters. Being able to upload sheets from multiple systems would've also been helpful in the campaign. So yes, I think this really needs to become a thing for Roll20.