I am quite confident that before I had kids, I said things like "just tell your kid to focus, discipline them, they have to learn"
And by and large, I absolutely agree that even kids with disorders needs to learn self control and discipline.
However, I have a daughter that is in constant motion. She is impulsive, she wiggles, she seems to be three places at once. I friend who is an OT suggested she thought she had a sensory issue and gave us some tips to help. This was pre fidget spinner, but we did things like put bands around the legs of her school desk (with the teachers that would allow it), or some magic sand or silly puddy that she could mess with at her desk. The rule was that she couldn't distract other kids with this stuff, but as long as she kept to herself, was quiet, and the teacher was OK with it, she could use it. Lo and behold, she was able to contain herself in her desk and stay seated, when before, the teachers would tell us she was constantly halfway out of her desk, bouncing on her legs, etc.
And she's hella smart. Doing very well, and the teachers love her.
You may call it a "crutch", but I call it a tool. And as long as it doesn't hurt anyone else, what's the harm?