It's a great Plex client, YouTube client, Netflix client, Prime Video client (of course), and quickly took over primary video source duties as soon as I installed it.
The prior version (the not 4K one) struggled with even 1080p H265 decoding, but the 4K version handles H265 and all the other formats I've thrown at it just fine.
Even when the TV was brand new, the apps on the TV were terrible (sluggish, disjointed UI, TV remote not comfortable to use as primary remote). 4 years later, they're not going to be any better, while the HDMI input sources can be easily and cheaply upgraded.