Apple has more to gain than does Godot. Money and headsets cannot faithfully account for additional complexity and coordination tax. Nevermind potential constraints on other platform expressions of the game engine.

What you want to do is first decide whether it is strategically valuable to be on this platform. If it is important, then you want to make sure there’s ROI in approach. Doing things in reverse, I.e. seeing whether there’s a cost-effective path to support another platform before deciding whether to support is is misguided in my opinion.

Just because you can doesn’t mean you should.