This just occurred to me:

Suppose you've been opposed to vaccinations until now and finally decided to get one. Well, it's 3 at this point. So if you get Pfizer or Moderna today, you're looking at a second dose in 3 (Pfizer) or 4 (Moderna) weeks, and then you have to wait another 6 months for the booster. It's not really clear to me what happens with J&J since experts are saying it should have been a 2-dose vaccine all along.

I don't know about other people, but I'd be a nervous wreck if I were behind by that many months during a pandemic and just now realized I'd been a dope all this time. It would totally be my luck to catch Covid just as I got my head of out my ass.

I got mine as soon as I was eligible and was still counting the days.