Like, I’m probably answering myself here but I think it is pointed out by gatekeepers who can’t stand the idea of community growth and everything should adhere to some other unfound arbitrary way to keep things ‘pure’ in a community.
When they forget that they too, started out as new and that they too probably have had other people sneer at them for simply being new. So now they go around and pretend this is some kind of ultimate shut-down insult to people who’re just trying to contribute to the fediverse by devaluing it by saying “OH U JUST SOME DAY OLD ACCOUNT, NOBODY SHOULD MIND THEM!”.
A bit of internet history, account age was a measure of clout on Slashdot.org. Your account ID was posted as part of your replies, so the lower the number, the longer you have been on the site.
Mine personally is in the 1.3M range, and I still read the site and I still see users posting on accounts as low as 500k ID, those have been around since the late 90s.
The site is just a news agrigator at this point with a comment section full of boomers and greybeards (sys admins that probably should consider retiring), but its been my home page for ~20 years and I have no intention of changing that.