It's your fault I actually bothered reading the comments then. Couldn't resist. Interesting mix of angry American snowflake types and then angry anti-vaxxers, howling in protest that they're not allowed back in yet.
If the Japanese government is going to standardize the vaccination requirement, it should really considering increasing the number to 4 shots. I mean, by the time general international tourism is allowed again, restrictions or none, it's probably going to be well into 2023. I had my third/booster shot last September, almost exactly 11 months ago. I took the liberty of lying to the nearby pharmacy and getting another "booster" shot about five months ago, which is probably why I had a largely asymptomatic experience when I caught COVID two months later. And now the U.S. government is saying that the modified Omicron-targeting booster shots will be rolling out in late September or early October, so I'll be lining up for that one, too. By and large, most experts agree that the immune protection provided by vaccines only lasts between three and six months. If the Japanese government is going to resume international tourism sometime in early 2023 and wants Western foreigners to have any semblance of vaccine protection and ensure they don't burden the healthcare system if they get sick in Japan, the government should raise the requirement to 4 shots (or at least require the Omicron booster).
Plus I would very much enjoy hearing the enraged anti-vaxxers throwing fits and vowing to never visit Japan again. It's a win-win.