Nobody is saying anything like that. It would be extremely easy to rebalance such that disc healing remained roughly the same or average for all healer classes/specs but so that damage with one of the covenants would be on par with h pally! Think outside of the box if you have to so that you can imagine it. It is far from unimaginable. It’s just playing with a few of the numbers that certain abilities do.
For example, you could scale up the damage that boon blast and nova do, but scale back the atonement transfer they do so that the damage was up but the healing was the same as now. That is a very minor tweak on the part of coding.
On the other hand, Venthyr Ashen Hollow could be nerfed so that the damage it does was on par with other covenants, like Disc Boon, for example.
The whole point of this is not to address healing but the damage discrepancy.
One benefit of doing so would be to allow other healers access to higher keys. I was healing 15s the first week of 9.1 with 226 gear, but now with 245 gear I get turned down for 17s constantly because everyone wants h pally damage so that they can time their keys. That translates to either the need to play h pally or simply not play the game to your potential. I doubt that translates into satisfaction with the game for people who did not choose Venthyr pally if they want to push higher end content–and in the case of people who are not sure if they want to continue their subscription or not or reroll, I would bet some just quit. Grinding to get another toon up to speed is dull and time consuming.
If you think it is only people who and want to push high keys–like 17s and higher or 21s and higher, it is not only them. People doing lower keys, like 12s, also have an easier time if they can pump damage.
I have friends who simply roll h pallies and get a high io that way, and then use that high io to get them into keys on other toons. But the score does not reflect player skill so much as simply having rolled a “meta” healer. This takes away from the objective value of a good io score because it less reflects skill and more reflects simply choosing a class that pumps broken damage no matter what the player skill level is.
So to think the problem of broken damage is only superficial is far from realistic.