For example, if you support a Youtube channel you might continue watching on Youtube and rarely need to visit Patreon's website at all.
But if you support an author who is releasing a book, three pages per day? And you're paying for early access? You'll notice there's no bookmarking / next page features.
And if that author has three price tiers, depending on how many pages of early access you get? Only the most expensive tier can get new-pages-uploaded e-mails - new pages being unlocked for lower tiers isn't an event that triggers notification e-mails.