Maybe the Steam Link and Controller weren’t as popular as Valve hoped they would be, but damn everyone who still has them seems to love them.
Maybe I’m biased because I still have my controller and love it, and I gave away my Steam link because my Deck can do that too, but my friend who received the link is loving it.
The Steam Controller is one of the best pieces of hardware I ever bought. There's something incredibly chill about playing strategy games not originally meant for controller on the couch. I also genuinely like fiddling with cool setups and radial menus for it.
I never really liked the Steam Controller when it first came out. My Dad was actually the one that had gotten them and even he seemed to have set them aside after awhile, as they just collected dust for ages after that. I picked them up from him a few years back and I've started using them with my Steam Deck and they're actually pretty nice, I get it now, though I kind of wish they still had analog sticks.