It’s terrible from a UX standpoint. By definition, translucent elements present more potential information to a user. It makes it harder to parse certain screens. It’s a nightmare if you have subtle vision issues (where it’s not bad enough you’d need to enable accessibility options). You’re not going to “get used to it” — you’re really just adapting to a crippled interface.

I think it all stems from trying to unify the UX/UI across devices, and to also pull the Vision VR device into that iphone-iPad-MacBook-watch grouping. Handoff and other cross-device interactions suffer when you have significantly different UI elements or interactions.