Soundbars -- and also improved built-in TV speakers -- have eaten the low-end receiver market, for sure, but there are still a lot of other installations. A soundbar and stuff like Sonos are still compromises vs discrete channel speakers, and many people are still willing to pay for better sound. You don't have to go too high end to want better sound.

Marantz gear in particular is great, and Samsung buying them seems really unfortunate. Might be better than some private equity randos though.