Yeah, I definitely agree that's it's targeting a niche within a subset. I think we're coming from completely opposite camps, though. I've never had, nor was ever interested in owning a gaming PC. I have some Apple devices for work, a PS5 (and switch) for gaming, and a cheap little android handheld for retro titles -which coincidentally I use to remote play my PS5 from bed almost every night.
For me, adding yet another platform to my ecosystem is kind of annoying, particularly with all the tweaking, tinkering and menuing I won't be able to avoid. But a Deck also means I'll be able to play older windows stuff that either never came to PS or were lost in the PS3 library, and I'll be able to travel with it better, so it's kind of worth it. Plus it'll look really nice when remote-playing my PS5.