These all feel like issues that power-users have, not an issue that lil' ol' me is going to run into while jotting down journal entries, or yelling at people on the internet with emphasis.

Except if you want to yell at people using different colours and font sizes in a sentence, like in the old forum times, for which markdown is too restrictive.

On reddit you could really yell at people using a h1 headline in comments, not sure if that's still possible.. hn __is__ more *restricted* sadly