Yeah, as someone younger (and therefore newer to webcomics), I'd agree with you on Homestuck, xkcd, and Penny Arcade.
Homestuck, I remember being really big around the first half of the 2010's. Heard some people talk about it in school, and my sister (who's been to conventions more and longer than I have) told me the fanbase was a large, if a bit rowdy, bunch. Personally, I tried it then and now, but never really cared for it. But to each their own.
xkcd and Penny Arcade, I've never read in-depth either, but have seen several of their strips. xkcd especially, I see shared a bit still, usually in the form of someone referencing a specific strip in a reddit comment section.
Looking at Hiveworks, I'm only really familiar with three of their comics.
Lost Nightmare. I read it a while back, having discovered it while looking through smackjeeves Wayback. Actually enjoyed it quite a bit.
Technicolor London. Another I found while messing around on Wayback, think it went through a reboot, as the first few pages didn't line up with the current ones. At least, from what I remember. Might read it one of these days (I mean, I have all the time in the world right now).
Love Not Found.
This is one of two comics I knew my sister read that I never looked into because they were 18+. That, and Starfighter. She never spoke about LNF, but she did so about Starfighter. I can hardly remember what she said about it, other than her saying the names of the characters, Cain and Abel.
Now of course, I know Starfighter was super popular then, and (from what I've seen) seemed to really popularize BL webcomics. It, and another giant that's gone down in infamy due to how it ended...Teahouse.
Anyways, I've rambled too much about comics, and my experience with them.