What I really like about unicomp stuff is that they are a really easy way to get a nice feeling buckling spring board, which is really cool. It also is a great way to get replacement keycaps which is nice (they also have unix and apl style ones which are cool to see as well)
I agree that unicomp (and buckling springs in general) aren't as talked about than something like mx, which is a shame because BS is really nice. But I do understand it why though, in the hobby now pretty much everything revolves around mx because it was the dominant force in the mk space, which means there a lot more options in terms of different feels and ways to customise the feel of what you want, while also offering pretty much all of the customizability in the hobby.
Custom keyboards are really different though, it is mostly form over function but customs can offer great typing experiences, especially well designed ones. While mx is limiting and other switch mechanisms can be better for a lot of people (I prefer BS over pretty much all mx clickies for example) if modded right they can still feel great, stuff like blacks and browns broken in, lubed and spring swapped are feel great to type on.
It is up to the person whether they can justify spending a lot of money on a keyboard though, I can totally understand why someone wouldn't and honestly for most people, a keychron/hhkb/unicomp is the only thing they need and probably should get.