The section "Reviewing old cards can become a chore" describes well why I got so frustrated with Anki that I wrote my own flashcard program for private use. The answer to that for me was to simply not have timestamps at all and instead treat intervals as a quantity of reviews. When you run out of reviews, then you can add new cards. It's probably still not the most effective for language learning, but at least this way is more fun for me.
@madewokherd If it's way more fun, you'll do it more, which to me translates to effectiveness! :)
(Sorry I didn't see this comment earlier!)