I suspect you may have missed an issue surrounding PMP, that the Plex organisation has introduced an aura of disquiet regarding this player and it’s continued availability and support which is difficult to suppress. Going back to 2015 it is clear that something unknown to the general user is driving Plex to abandon the player, that being highly questionable claims that it would save electricity, I mean this is a BS reason if ever I heard one.
As for the additional hardware devices that are available, they are always a poor substitute because they are so quickly superseded and generally cannot be upgraded, atmos is good example. The built in apps on TVs are another mine field.
Some of the issues are not apparent in a LAN environment but quickly become so in a WAN environment.
PMP is also based on mpv which is the still the best video player available.