Unfortunately, what you’re effectively asking for is class homogenization.
I’m also not following your trail of logic regarding nerfing over performers versus buffing under performers.
Blizzard know what they want the overall numbers to be to achieve a certain difficulty. Blizzard look at charts and see variances across spec performance.
It’s not about “make numbers go bigger”. If it was, blizzard would make it so that any single person could one shot a raid boss. Know why it’s not that why? Cause nobody actually wants it that way.
The point achieving balance is not always “buff everything in sight”. This is a very elementary take.
To be clear, though, because wow is a lobby game masquerading as an mmorpg in many respects, I do believe the lobby elements of gameplay should provide equal footing in terms of utility across the three roles.
I think healers should be able to choose what types of debuffs they want to dispel given the content, but that cleansing ability could be mutually exclusive with other options. E.G, if you pick poison cleansing totem, you can’t cure diseases. Something like that. I do think the notion that one healer is much less viable than another simply because the other healer can’t cleanse a particular debuff is a bit antiquated. I just think there need to be choices in the talent trrees
I’d agree because of the reality that instanced content exists.
Class homogenization in an MMORPG should generally be discouraged.
But this isn’t really an MMORPG. It’s a lobby game pretending to be an MMORPG. As a result, healers especially need all available utility options. After all, “bring the player, not the class”