I read the epilogues right after finishing homestuck in 2023 so I can really only answer from the perspective of a new fan (so sorry if this is totally unrelatable to you!) and I'm so thankful I did!! After finishing the comic I didn't have a fully formed opinion on all the characters yet, especially since a lot of the characterization went right over my head (I read as fast as I could because I was enjoying myself, but I should have probably taken my time to really get into the text)

The epilogues basically gave me a new chance to think about the characters and the story and the surrounding narrative. It really opened my eyes!! Reading Jane's arc and having to go over what I knew of her in my head was a fun excercise, basically retracing the steps that led to her doing all that. Also, it motivated me to re-read Homestuck, this time trying to actually take it all in and look out for the all the things that the epilogue and post canon are a continuation of

so in short, I enjoy the epilogues and post canon a lot because it offers a new way of looking at the story and incentivizes a more thorough reading of the text

also, I like homestuck so I'm generally pleased about there being more canon content, especially now that I can read it live and have way more time to digest the story