Seems like that if you look at q times. I prefer tank but after that its support easily. You can click heads and get kills so you have the same play making potential as dps in that regard. And you can save allies, which is also impactful.
If you’re on dps and see your ally make a mistake that will get them killed your options are very limited. You can kill the enemy before they kill your ally but if you can’t because of angle/ttk etc you can’t do anything unless you’re mei, genji and a few others.
Meanwhile support can see an ally walk straight into a junk trap, shatter or grav and save them with immortality, burst heals, sleep, big ults etc. And they get ult charge from healing so not only do they have better ults, they also get to click on them more often.