That's an interesting question. My first response is: hell no. But I think what's behind your question is the fact that part of UX/UI is to abstract experience

That's an interesting question. My first response is: hell no. But I think what's behind your question is the fact that part of UX/UI is to abstract experience and interface. So maybe if I first had to poke at an alien OS I would try its UI as part of familiarity in getting to know it, but ultimately as a system architect, hardware developer, and former O/S dev with 4 decades experience, I want to see how it really works. The UI is always the topmost layer. I'd love to encounter a literal "alien" OS in my lifetime. That'd be a pinnacle of my pentesting & reverse engineering creds. Good question.