[j7ake]

Like piano it’s important to tackle courses that are appropriate for your level

Self taught people often skip too much of the basics so they struggle to properly tackle the fancy stuff

[vouaobrasil]

Even if they don't skip, they adopt weird hand positions that are hard to correct. There is just too much motor movement that needs to be done right that cannot really be explained or learned by watching a video or reading a book. It's actually similar to math in a certain way, where motor memory is replaced by subtle steps in logical reasoning.

[j7ake]

Maybe what’s common is that self taught people do not even know what to look for to improve on.

They only see the superficial or easy-to-spot goals and lack the eye for detail to build foundations and technique.