I know you didn’t. But most of what you said isn’t concrete evidence or demand of hard skills necessary for success with Support as compared with the other roles in the game. Support doesn’t have that kind of demand that the Damage-role has when it comes to mechanical aim, or even effort and risk with some ultimates found in the Damage-role in comparison to the Support-role.
You can certainly argue that Valkyrie is probably the most difficult ultimate, because it requires more effort beyond a simple activation. But if try to compare it to something like Dragonblade, which has a similar activation (and transformation ultimate), you’ll find that Dragonblade is substantially harder to get value out of it than Valkyrie or Tactical Visor.
And then there’s Transcendence and Sound Barrier, both very easy to get a lot of value out of them. Same with Coalescence, and Rally. Nanoboost really rely on the Support to get any value out of it, and Kitsune Rush is going to still depend more on the team to get value out of it, than Kiriko herself.
And when we talk of utility - that’s Sleep Dart, Soundwave, Protection Suzu, Biotic Grenade, and Damage-boosting (through various sources) - most of these don’t require much aim or precision. Sleep Dart is certainly hard to land on a non-Tank; but Biotic Grenade isn’t too hard to get its healing values or the healing buff out of it. Soundwave has a wide-arc and is easy to hit.
Damage-boosting is an easy, no-frills switch for Mercy, and Zenyatta just has to keep sight on non-barrier targets for Discord. There’s no cooldown, so there’s no punishment for failing with Discord, either. And aiming it isn’t hard comparatively.
Now doing damage can be challenging for a Support hero, but again, still easier to do than the damage-role. Mercy’s projectiles don’t have fall off and two and half times larger than Genji’s or Hanzo’s projectiles. Likewise, Zen’s travels twice as fast as Genji’s and more than three times as fast as Pharah’s or Junkrat’s and is both larger and can critically hit for similar damage (Discord applied). Moira’s beam aim is the widest outside Winston, and also applies some self-healing to her, and Kiriko’s kunai are both larger and just as damaging on critical hits as Mei’s alternative fire. Two headshots yields a kill from both.
Now it is true, that Supports - most of them anyway - don’t have any damaging abilities to enhance or guarantee kills, but that’s also not really their job. And they do have to juggle a lot when it comes to active-triage; something that can be stressful to do. But I don’t think it is anymore (or less!) stressful than it is for a Damage-role hero or even a Tank-role hero has to deal with in their job or role. And it isn’t less important than any other role, either.
Now that I’ve listed off several concrete examples, and comparisons to show you how easy and how capped the Support-role is, I’m hoping you can either agree or provide a suitable rebuttal.