What other headset shares the Quest's UI? Most headsets aren't even standalone like it.

Pico kinda copies the quest UI. I was surprised how similar it was.

I bought one to hold me over until the quest 3 came out but it had a wobbly lens flaw that made me nauseous. It turned out to be quite common. I had to return it. Luckily the quest 3 is now out.

Given they were talking about the quest 3, it shares the same UI as the quest 2

Sorry, I thought the implication was that the UI was also made by another company.

In my experience the UI and everything in the Quest 2 and 3 works great so I don't understand where the original poster is coming from at all.