Perhaps I was overly strong, but my point was that whatever you're learning at your job, you'll learn it faster if you're starting your own company. I worked a few jobs right out of college and I learned some stuff that I think is applicable to our startup, but I was still virtually clueless when we actually went to start it.
When it comes to the quickest way to put yourself in a position to successfully start your startup, there's no comparison between learning at your job and just starting it.
This is super important because the longer you wait, the more risky it becomes to start your startup in the first place.