Nobody is saying that healers shouldn't heal. What people are saying is that given how FFXIV is designed, healers shouldn't heal all the time.
If you want to use strawman arguments, at least try to make them harder to debunk.
And, again, it's not a simple "expectaction", it's how the game is designed. You are not only arguing against the people who like the way things are, but you are arguing against the game itself.
Not all games are the same. Including MMORPGs. If this one is designed around the fact that you have downtime to use damage spells, then that's how it is. Again, you are trying to make a general rule out of a subjective preference. That's absurd.
Final Fantasy XIV plays like Final Fantasy XIV. Saying "but in some other games healers only heal!" is completly irrelevant. Nobody cares about how it's done in other games. They have no authority to dictate anything, nor do you.