I was looking at some of the "beginners" lessons just because. I already knew the stuff, but taught myself, and was just seeing how it should be "formally" done. Anyway, I came across the vibrato lesson. When it comes to the really high frets, I tend to vibrato by moving my finger back and forth horizontally within the fret. It said that this is "unpractical" I believe.

It's just so much easier for me this way, without making wrong strings sound. Is it really wrong?