As for the rest, it's hard to know what to make of it. It's like you're building a superpower out of failure to be able to focus when it's necessary to focus. Like if someone couldn't stand still, and you said something like "I bet it's really useful, because you never get stiff, and you burn more calories", but ignoring that it's fucking terrible, because you can't ever sit still even when it would be advantageous to sit still.
Note that executive control is also about planning. Of course it can be useful to rush of without planning, like when being chased by a panther. But it's not a good idea to have a significant deficit in the ability to plan. "Silly bullshit [that] doesn't matter" can mean not having the ability to pay for food, and it can mean having terrible stress over accomplishing trivial tasks (like filing out tax paperwork!).
Anyway. You're welcome to continue to not-buy ADHD, but recognize that people who live with, and who study it, think it's a thing.