One of my favorite uses for Drafts is sending emails. I am now using a combination of Siri Shortcuts and Drafts for this. I could technically just start in Drafts but I like some of the dialogue boxes in my workflows that I use. Here is a recent example of a workflow that I use to send an email that could easily be modified.
Additionally, since the advent of the Drafts Mac app I’ve been using Drafts as a quick note storage. Before I really needed something cross-platform on iOS and Mac. While some would use something like NValt I never got it to stick. Now I can have all my notes in Drafts.
For work, related to the notes, I will write up quick proposals or notes and use this action with some modified CSS to fit my context, to send to others.