It's partly because WebGPU has very conservative default texture limits so that they can support old mobile devices, and partly it's a problem for engines that may have a bunch of different bindings and have increasingly hacky workarounds to compile different variants with only the enabled features so that you don't blow past texture limits.

For an idea of bevy's default view and PBR material bindings, see:

* https://github.com/bevyengine/bevy/blob/main/crates/bevy_pbr...

* https://github.com/bevyengine/bevy/blob/main/crates/bevy_pbr...