This is one of the most amazingly useful mods in history, but it last updated over half a year ago, and it's only on 1..12. Later versions don't have anything like it (there is Mining Tweaks but it only allows you to change blocks for some reason). Is there any possibility that it may return for future versions? I don't want to sound like I'm badgering anyone for updates, so I hope I didn't.

Basically, yes. I'm done with modding for Forge. If anything, this will come back for Fabric only, but that is unlikely too.