Yet I think you missed the point that Liam was trying to make: Healers are extremely unengaging in 95% of content and nearly effectively braindead with heals in that unengaging content.
Dungeons - Just heal.
Normal Mode Raids - Just heal.
Alliance Raids - Just heal.
Solo Instances - Spam 1 Button and 1 DoT ad nauseum.
Yeah. You can see how boring the role is after you've done everything on your healing checklist and the Tanks/DPS aren't dying. Savage/Ultimate pushes the jobs further to their maximum because your new shiny tools actually matter in this instance. It's not about who does the most damage, but rather about healer engagement. It's what we've been yelling at them to do since we figured it out in Shadowbringers - and they still haven't listened.
If you're looking at the base game itself, excluding Savage/Ultimate, you have a game where you do not require 20% of your buttons or shiny new tools to clear content. Heck, one healer would be enough and they still wouldn't touch a whole lot of their kit. This is why raiders are focused on improving to take on Savage - because Savage is challenging. So is Ultimate to a greater extent. In these areas, you use the full extent of your kit and it's where you actually see the job's strengths and weaknesses if they weren't already pointed out in Extreme Trials for some reason or another - and this includes our engagement and where it is aligning during points of Downtime if you bother to think about where the damage is when you're healing a Savage fight. Of course, one can say that "SGE just heals by DPSing! That's engagement, right?" No. SGE is not exactly as engaging as it should be - and the other healers are in the same boat. Sure it has Phlegma and an extra damaging GCD, but I'm still pressing the 1 Button a lot when I'm not executing mechanics or don't need to heal, either because I've already done my checklist or my co-healer and I are working in tandem.
At the end of the day, what the charts say is that we hit the 1 button too much even in Savage/Ultimate when there isn't any healing needing to be done. That's why we're going to continue pointing this out until Yoshida and the Dev Team bother to do something about it.