I don't quite agree with this.
A chunk of the player base will simply seek out "what's BiS" for everything, even if there isn't an answer. So people looking for BiS of covenants isn't a demonstration that covenants are poorly implemented, it's a demonstration of a specific player mentality.
The only way you can avoid such players for always seeking BiS for everything is to eliminate all choice for anything that has a game mechanic impact, which would be, a terrible design choice.