Yeah, these all seem like power-user features for people that want more customization options, and I've more recently reverted to a simpler config with only the most necessary customization. I'll give it a proper try next time I redo my vim config!
Yeah (and I've said this elsewhere) I think people should use the tools that make them productive! So if that's fzf (or something else) then keep using that.
I honestly just made telescope for fun on stream to start with to explore some ideas about fuzzy finding that I thought would be fun. It just happened to be that people liked it and it grew.
We have a pretty active gitter group & people hanging out in the issue tracker, so feel free to ask questions there!