Why does "most comments" not feature a time frame?

Why is there no choice of default sorting for comments?

Lemmy isn't an advertiser oriented platform. It's a discussion platform. I strictly believe default sorting by new comments and most comments being improved is absolutely necessary. I would go as far as to suggest making sorting by new comments the default and most comments (last 24h) the default for sorting feed. I believe that would tremendously improve the user experience AND engagement because they'd have more stuff to engage with. Sure, there's an argument to be made about burrying less active threads, however, the users who won't see those threads I believe to be the users who'd just scroll past them anyway.