What's the point to address? Your covenant choice will differentiate you always from 3/4 of the covenants, whether you keep the same covenant or chose another one you are still going to only differentiate from 3/4 covenants.
You'll always be the same 1/4 unique, regardless of you or other people switching. This is not something that can be resolved for you through locking or unlocking covenants, it's just math.
The game has always been about choosing and being able to chose what is best, sans rng stuff like Legiondaries and other gear(read corruptions) generally, but essences, talents, your spec are all changeable. And as you know the rng aspect of Legiondaries was resolved later, a corruption was added later as well, essences have always been swappable and so do talents, in some expacs for a small fee.
This is the only time in the game where you are time gated (2 weeks grind) from actually modifying your character in such a way. In the past what you grinded is what you kept.
I see no reason to lower the amount of customization that the game has and so do many others.
We'll see when this hits live if the majority likes the system or not i guess.