I think another problem with the mindset of kudos/comments on AO3 is part of the “stalking” culture on instagram. If you like a picture that is months old on instagram, its “insta-stalking” because you had to scroll through that person’s profile in order to find those months-old pictures.
That is NOT how AO3 works. It’s not cringe or embarrassing to find a fic that was posted in 2012 and like it. It is there to read.
Same for works on AO3. Sure, maybe some of us have some old works that aren’t up to our current standards of writing. But I, personally, am never going to look at a kudos email and think “ew omg I can’t believe someone found this fic from 2016 why are they liking it”. In fact, I am entirely going to go “nice! people are still reading some of my older works too, I’m glad they enjoyed it”. It’s an archive, it is meant to be a collection of transformative works, old and new, and you are meant to find them.
In fact, if you find a work that is from five years ago and you really liked it? I bet the author would love a comment even then.
Stories are written to be read.
Show some appreciation.
Older stories need love just as new ones. Please don’t let stories and chapters die of neglect after one fucking week!