There's an excellent piece on one of Warren Huart's videos where the point is made. There Are thousands of brilliant musicians who know every last technique, you can find them allover Youtube however, the best musicians play the song not their ego. The biggest issue I have ever faced in the music biz my entire life, is dealing with people who believe that, because they are a technical genius on their given instrument, the songs they write are somehow magically, automatically good songs.
Here's an interesting insider's fact for you. In the decades I have been in the biz I must have heard a couple of hundred "songs and projects" that are in the words of the engineer and record company staff playing it to me. "The next big thing" and not one of those bands or songs have ever gone to be a real success.
I know one major record company who,, for about a decade, had two people and two people alone who were the acid test of whether a band was liable to "make it". Both were absolute and yet utterly charming "wrecks" of people who were liable to lose their way between the bedroom and the bathroom of their own house. Both of them, if they said "They have what it takes", were all that record co needed to know. I would suggest this, that in the past 50 years, the top fifty or so guitar based bands from the UK were "headhunted" and "discovered" by less than 2 dozen people.
Remember this, Frank Zappa and The Velvet Underground were both "discovered" and signed by the same person, legend has it, on the same day.