> I’d be interested to hear what anyone who’s able one-shot their writing thinks of this. I feel like that type of person may have less of a desire for this kind of stuff?

Yep. I don't use spell-checking and I don't use auto-complete bars on phone keyboards, largely because I feel it keeps my skills sharp. I would use tools like the article describes when I deem them to have become necessary to stay competitive at what I do, but at the moment I don't feel it's clear-cut whether their use would promote or harm my faculties to write.