I have a similar experience with my high-end Samsung TV from 2013. The TV itself still works perfectly so I'm not replacing it soon (still 1080p, not 4K, but...), but over time, Samsung has steadily removed key features with each update. When I first bought it, it supported Skype video calls (and now the integrated webcam can't be used at all), IPTV streaming, and various third-party apps — all of which are now gone.
NEVER BUYING A SAMSUNG TV AGAIN