My minimalist writing tool is the one I wrote: https://enso.sonnet.io.

I must admit that my definition of minimalist is a bit more strict: writing is separated from editing so you can stop censoring or second guessing yourself. You can't edit, select, scroll. The only thing you can do is to put your text on the screen, as a sort of stream of consciousness. I've been using every day it for almost 3 years for journaling and to organise my thinking (ca. 800 words per day). Check it out!

Important: it's not a tool for structured writing. When writing articles with sources, cross-references, I use Obsidian and export the .md files to my blog on 11ty. It's over-engineered, but since I don't have to change anything, actually fast. Plus, [[links]] in Obsidian are a killer feature.