My theory (at least for the image) is that someone at Meta has decided that “big has to be bland”. They want their software to be super mainstream, the “default, vanilla” VR world that every other VR place will be compared to. (Maybe one is more Super Mario, another more gritty.).
If you tell the design team to aim for blandness maybe it destroys their artistic tendencies so completely they are unable to make anything that looks remotely good.
IMO this project needs an aesthetic leader. A bunch of technically competent people building tools they think might be useful is very likely to result in a bunch of unappealing stuff no one wants.