>What posts like this neglect to consider is that the overwhelming majority of people who use social media apps didn't use the internet during the "old" era.

They don't neglect to consider that at all - what people are nostalgic for is the web before it became mainstream and got ruined by muggles and corporations, when was just an exclusive club for nerds. Implicit to the concept of resurrecting the "Old Web" is recreating spaces that will never appeal to the masses. That's a feature, not a bug.