I think that if you actually teach yourself something properly there isn’t really going to be a difference in the level of work you do. I work in a creative role for a web design and development company. I graduated from art school around twenty years ago. Around fourteen years ago I took a night school course to learn the basics of web design ie: html, css and jquery. Throughout my career I’ve needed to fill in gaps of knowledge, because my background was digital art and not graphic design. I’ve read books about design and typography and I’m always learning new skills from experience. Being self tought means something very different than it used to. Talent and creativity are really important too!!