I mean, by that same argument, isn't 1v1 Commander a sign that WotC is trying to get rid of the Partner mechanic?
No, because Partner is a mechanic actually made by WotC done multiple times, and the recent set Commander Legends proves they crazy love the mechanic and will to put it in future sets as well.
On the other hand, not a single card in Magic that was made for commander ever mention the existence of Commander Damage. We have cards that outright mention commanders and command zone, but nothing that cares about commander damages. Which means that if this rules wouldn't exist, it would literally change nothing to the life to new players approaching to the format because not a single card would ever need an errata to fix that.