MNblockhead
A Title Much Cooler Than Anything on the Old Site
Eventually there will be a huge amount of pre-made 3D battlemaps. There is already a lot of content for 3D assets for Foundry w/ 3D canvas.Except I can take any decent top-down battlemap that I find on the internet, plop some simple tokens to it and call it a day with a 2D VTT. I don't always do complicated spell animations or dynamic lighting.
But you can't have the equivalent of "just plop a .jpg from /r/battlemaps" with a 3D VTT. You either get a premade map that perfectly includes everything (which would be pretty good for APs, admittedly), or you need to design the whole 3D space from scratch, essentially becoming a level designer.
My issue with 3D Canvas + Foundry isn't finding battlemaps, it just having to setup and manage the modules is Wonky and subject to breaking whenever Foundry is updated. The creator of 3D Canvas is well funded via his Patreon, so I'm not worried about it being abandoned in the near future, but it does take more effort than many will want to deal with. At this point, I'm just tinkering, I'm not sure I want to bother with the extra effort to actually make it a main tool when running my games. Maybe a rare set piece battle.
The advantage of a platform built as a 3D platform is that you won't have to deal with any of that. In which case you only need to be able to get access to 3D assets. If there is a platform that attracts a lot of users, then creators are going to create for it.