Well that escalated quickly! 
Doesn’t Obsidian and Bear do this by default? Obsidian, according to a recent survey is one of the most used notes apps. I wonder how many markdown apps either render the formatting in the editor or provide a preview built into the app? This would certainly indicate that a large number of people want to render the markdown formatting syntax.
And yet no-one is forcing people to use ms word, but they have plenty to say about how terrible it is and they don’t encourage people to use it etc.
That is true and I apologise if I have offended anyone. I was making a simple observation. As soon as you add something to plaintext it isn’t plaintext. That’s not me making an absolute, but simply measuring things by text format standards. Plaintext is, well plaintext, markdown is plaintext+. So my comment above was not a universal absolute stating why people used markdown, but a simple observation that markdown, by the mere fact that it adds formatting to documents ceases to be plaintext.
Somebody has to keep the lights on.