Yes, I also agree with the advice but not the conclusion. I suspect the only people in their 30s who can honestly say they spent their entire 20s in full-time

Yes, I also agree with the advice but not the conclusion. I suspect the only people in their 30s who can honestly say they spent their entire 20s in full-time pursuit of a career in their passion and got nowhere are PhD graduates. This says more about PhDs and mistaken beliefs surrounding them than anything else. I feel like I had more options for what to be (i.e. career) than I was aware of, it's just the "how" that was left out.