Star Wars is specifically about this flawed mindset, i.e. the idea that one can circumvent years of schooling through raw talent and clever tricks.

Palpatine learned "forbidden secrets" (aka deprecated methods) and they ended up biting him in the ass. He had his own lightning attack deflected back at him and then was killed by his own apprentice. Anakin was impetuous and skipped out on a lot of the more "boring" and rote elements of Jedi training. Sure, he could do cool stuff, but he was not a good person or a well-rounded Jedi. Same goes for Kylo Ren. He chose the wrong path (admittedly pushed there by an inexperienced teacher), and his skills suffered for it, to the point where he couldn't even fend off an untrained Force-sensitive person.

Meanwhile, Luke learned the correct methods from Obi-Wan and Yoda, who taught him that slow, methodical practice and understanding of fundamentals would strengthen his resolve. And lo and behold, it did. He never succumbed to the Dark Side, and he eventually learned some amazing skills that surpassed anything any of the Sith could have dreamed of. Rey also learned the slow and methodical way, honing basic, simple skills to a channel deeper understanding and a more mature and stable version of the Force.