Thats where you are wrong.
Anyone can learn to play an instrument to a high standard.
It`s a mechanical skill.
As I have said, living around the muso life all my life, I`ve seen plenty of people say, I`m gonna take up guitar.
And within a year, they are finger tapping as good as steve vai.
No different from spending a year learning in the studio how to produce properly.
Your argument doesn`t hold up, and is based on a very old fashioned mind set.

When I wanted to learn piano, I paid to have lessons. I had a good teacher.
I reached a high standard.

How is that different to someone doing the same for studio?

I don`t understand your point at all.