I think it would take a significant effort to bring some of the features I love about Superhuman to a Pine-like workflow. (Definitely not impossible!) The one I use most of all is a reminder -- "punt this email to my Archive until next Thursday at 8AM" where it will then re-appear in my inbox. I do something like that a dozen times a day and would need a very reliable replacement for that.

Search in Pine is guaranteed to be better than Superhuman. Unfortunately, Superhuman uses stemming for _all_ search, and you literally can't turn it off. You can use quotes as much as you like, but search for "Shipped" and you'll find a billion emails with every permutation of the word "ship" in it. It's awful.