Your first sentence doesn't seem to me to match the rest. It seems like much stronger advice, objecting to many more founders. The rest is about not committing to one project too early, while the first sounds like a much stronger advice against not being an entrepreneur for the sake of being an entrepreneur. Steve Jobs wanted to be an entrepreneur and tried a lot of things. Similarly, I think Zuckerberg wanted to be an entrepreneur, but it's harder to tell because his first commercial project was successful.

Also, some people complain that the "infinite runway" makes people fail to give up on bad projects. And, worse, to concentrate on the parts that interest them, rather than tackling a full product with sales and marketing.