I’ve used and loved Drafts for years, but it’s always been in a weird tension with my ever growing folder of plaintext notes. I was considering going all in on Drafts until I saw that I couldn’t easily leave. Portability > extensibility for me, personally. Still one of the best apps going though.
Funny solution: I imported everything into Bear and then immediately exported everything from Bear. Problem solved in ~6 min (not including a couple hours of googling).