The notion of "summer reddit" went hand in hand with notion of "mom's basement" and even "touch grass" in a way.
Namely, all are dated ideas from millennials that are still thinking the person on the other end of the comment is sitting in front of a computer, as the default. It ignores the simple fact we all have the internet in our pockets and can be chronically online AND actually out in the world doing things at the same time.
I'm set to scaled and subscribed by default which mostly gets me posts from the last 0-6 hours. But for some reason Lemmy on FF keeps logging me out so I get to see the default all with active sort and it's a wildly different user base.
There was a post the other day in like Linux memes about case sensitivity in the file system. Early on the post was mostly the Linux die hards who love their case sensitivity. After about 1.5 days it showed up in active and all of the newer comments were (probably normal people) bashing case sensitivity. It's almost like R*ddit to a degree where the general consensus in the comments can change over time as different users start seeing the post.