It's time to kill the argument that DPS abilities keep healers from healing.

[RopeDrink]

The main reason people wanted Holy Paladin (in Shadowlands at least) was Venthyr specific (ie. Hallowed Ground). A long CD AoE burst that was universally usable in M+ regardless of the weekly affix (seeing as it's AoE centric, only having to differentiate between either harder bosses or harder trash). Either way, having access to a massive AoE overtime burst (which heals people inside for good measure) was obnoxiously strong. I believe it was meant to be nerfed/reworked, but I haven't seen it if so (given I quit some time before the lawsuit shenanigans happened). Some would still desire Holy Paladin if they weren't Venthyr at all but to a much lesser level.

By comparison, simply spamming Chain Lightning on a geared Resto Shaman -- mine of which was also Venthry with Chain Harvest, which almost immediately puts you top of the chart as soon as it's used -- will be keeping up pretty well with DPS for as long as this is possible to maintain, but as said, the presence of sporadic and completely chaotic damage (and just more damage-intake across the board overall), means you are always more inclined to drop this the moment healing is needed, and this happens more often than not -- compared to the more methodical dance of FFXIV, where you can literally tell exactly when damage is going to happen, how much, what type, etc, to a point of being ridiculously preemptive.

Even when you can time mechanics with the likes of DBM in WoW, the intake is still generally higher, people are still prone to moments of seemingly random spikes, and when trying to time higher keys without access to infinite res-spam (even with a full team of Druids or DK's), you really can't risk just letting people die for the sake of Healer damage, even if said damage is very respectable.