Organization! I really, really don't want to have 300+ episodes in my list when I'll have less than 100 chapters by the end of the story. XD This is a big deal to longform creators whose inspirations are comic issues that you buy per issue, or manga tankoubons that you buy per, like, a 180-page book. Imagine filling your manga collection bookshelf with individual pages of manga rather than tankoubons! Sure, we're making digital comics and not print comics, but there must be a way to improve organization.
This is why I chose to update twice a week instead of every 2-4 weeks with one entire chapter per update.
I was actually hoping to get the best of both worlds: maybe the ability to divide episodes into sub-episodes, so the episode list could be shorter but you'd still be able to have a separate likes/comments/etc. for each update/ sub-episode. That sounds kind of crazy even as I type it out, though, so maybe there's a good reason why Tapastic hasn't done it that way...? XD