I’ve heard it in a few places, one that comes to mind being an interview with some engineers that PC Gamer did. The RAM was originally half (on par with the Quest 3) but once they realized how much the potential library would expand, they bumped the RAM to 16GB.

This decision was made pre RAM crisis, of course.

They mention that the compute required to support streaming was also already enough to run standalone games. Removing the ability to run games on the headset wouldn’t have changed the design much anyway.