Yes, I hear that a lot. Might as well push on a rope, though.

In my early career years, a fellow employee came to work in track shorts and flip flops. He was a very, very good programmer. But he never got raises, and never got promoted, and complained to me about it. I suggested it was the way he dressed. He said the same things you wrote.

A couple decades later, I ran into him again at a conference. He ran his own quite successful company. He also was dressed sharply.

Things that make you go hmmm....