Agreed.
I took a typing class in high school back in the 90s and felt so inferior to my peers who could do 75WPM... I never got it right back then. It wasn't until I just completely forgot about all the rules and started writing regularly on keyboards that I improved. To this day I still mis-spell things and look at my fingers, but I type just as well as anyone else in IT, and probably get paid better than most in stenography jobs...
And then spell check was invented, which fixed a lot of my problems (although it's been wonky a lot lately for reasons unknown)
Just goes to show that the emphasis on learning a skill that may be valued at one point in time probably won't ultimately be what you need to develop fully in the long run.
I still look at my fingers when I play guitar as well, and I have pretty fat fingers. A guy at a guitar shop told me I'd never be able to play guitar as a pro long ago when I was just a kid, but that made me work harder at it. Many people who have made hit songs look at their fingers too, even Prince... You can tell if you watch enough YouTube live performances.
Rules on how to improve are usually just guide lines, not laws... Practice, dedication, necessity, native talent, and time spent on developing a skill are what really drive achievement. Developing a sense on what works best for your particular talents and being able to pivot to new things until you find your "success niche", is a big key to finding life-long success in my opinion.