I'd also like to expand on what other's had explained as well.
Another reason why you're likely to come across to players asking for more dps options in EN forums is because the commonly recognized talking point that is skill floor vs skill ceiling. Do veteran healers wants more healing to do? Absolutely. I don't speak for everybody, but things like Harrowing Hell even in normal mode was a pleasant, enjoyable treat for me. I'd love to get more of those. But play enough times in your regular DF contents, you'll soon realize how this might be disastrous for inexperienced healers for obvious reasons: they couldn't/knows not how to handle these increased HPS requirement. To heal and keep your allies alive is the floor for the role. Because well... we're healers - we're supposed to "heal first dps second". Everything else comes seconds. Paradoxically, even if they do increase the HPS requirement for newer tier/expac, SE also decided to ramp up collective HPS potential across entire roster incl. non healers (looking at you Shake it Off, new MNK & SMN AoE Heal, PCT barriers) so that 'increase' is immediately rendered moot. But if they're not, then where are we going to use our new shiny healing button?
So, what now? We're not healing more (We want more). We're not buffing more (which would be nice if we have that but SE hates giving us utilities + maybe AST but that has been trimmed further come DT it's almost a moot aspect). We're not debilitating enemies (again, would be nice but past example: our Virus was distributed away from our hands). What are we supposed to do besides our monotonous 1 button spam - which to add insult to the injury, all healer has the same exact fillers? I guess a race of who's to get break their nuke hotkey first... or weave /doze every GCD? XD