The lower end are getting carried by the extra gear they and their teammates have, not their skills. They would still be able to clear as fine as they do now (as proven by how wide is the gap between top and bottom dps of healers) and some could argue even better because the dilution of damage across a wider array of skills reduces the dps loss that a gcd heal (which is what these healers use to heal) has.

I find really funny that discussion arises for healers when asked to put a fraction of the effort that tanks and dps are required to clear any content with enrage. We are rarely asked to optimize our tools or keep track of cds or job mechanics to do our job unless you want to optimize while they do and there are zero complaints on their end. This design really babies healers to a fault.

But to not divert the discussion, the enrage problem is really a non issue. The only places where that really matters from a perspective of gating lower skilled players are ultimates and week 1 savage. Ultimates are pieces of content that those players dont interact with and week 1 savage is called week 1 for a reason, as stronger gear gets available for the players, the easier the enrage becomes, making less skilled/optimized players capable of clearing and this is something that wont change regardless of how many tools we add.