None of those are “major projects” by any definition of the word though. And none of the three has anything to do with wgpu's performance.

Rust for game engine has always been a highly risky endeavor since the ecosystem is much less mature than everything else, and even though things have improved a ton over the past few years, it's still light-years away from the mainstream tools.

Building a complete game ecosystem is very hard and it's not surprising to see that Rust is still struggling.