Being supported on a games console means that you can produce binaries that are able to go through the whole approval process, and there is day 1 support for anything that is provided by the console vendor.

Otherwise is yak shaving instead of working on the actual game code.

Some people like to do that, that is how new languages like Rust get adoption, however they are usually not the majority, hence why mainstream adoption without backing from killer projects or companies support is so hard, and very few make it.

Also you will seldom see anyone throw away the confort of Unreal, Unity or even Godot tooling, to use Rust instead, unless they are more focused on proving the point the game can be made in Rust, than the actual game design experience.