This is just completely wrong though and not at all how healers in FFXIV work. No matter how much Yoshida says this, the fights say otherwise - the game is not tuned for "just do some DPS where you can!" but instead for healers contributing as much DPS as possible. These fights are tuned around healer DPS. To see that this is the case, all we need to look at is the top E8S speedkill.
https://www.fflogs.com/reports/qCnHW...pe=damage-done
This is the E8S Rank 1 Speedkill. The rDPS requirement for enrage is 90725 and this group logged 104357 rDPS. If you subtract the healers, 104357 - 20662, you end up with 83695 which is 7000 rDPS behind the enrage requirement for the fight. And these are the TOP players for the fight.
If the content was tuned around not requiring healer DPS or just having healers "DPS where they can", it wouldn't be impossible, if not close to impossible to clear even if you had 4 of the best DPS players and 2 of the best tank DPS on the planet. This is the core problem, healers are in fact not "meant to heal." The design encounters that they're sticking with demand that we DPS, and using our GCD healing is always a DPS penalty not just to ourselves, but to our entire party's potential clear.