Please correct me if I’m getting your suggestion wrong. The way I’ve been reading it, you’re asking for Plex to improve which quality/version of an item (movie/tv-episode/…) is selected when playing it on a device – e.g. not to pick a 4K version on your 1080p TV if there is a 1080p version of the same video.
While the post I linked will also specifically mention this for movies… the underlying story is the same – picking the right / best available version for that client to get the best possible quality with the minimum amount of transcoding (or no transcoding at all).
That’s how feature suggestions work. They’re getting even less attention if the same keeps getting requested in new threads (hence the rules for the feature suggestion category).