I only use several styles throughout all my notes. At the least I need a simple way to update the formatting of body text to my standard body text formatting (today I use shift + command + F but I'd prefer command + opt + 0 like in Google docs). And a way to easily assign standardized h1 h2 and h3, ideally with similar shortcuts to Google docs and other text editors — command + option + 1,2,3.
It's not just for efficiency... I don't want to have to think about formatting when I'm authoring. I don't want to have to open the little font dropdown and the size dropdown and scan through all the options. I just want to focus on authoring my note.
And at the end of the day I want all my notes to look uniform and be easily scannable. Today there ends up being wide variations in the formatting used because I am often pasting things in from around the web. I can't command + opt + v paste these in because then it loses ALL formatting and I don't have time to go and restore all the headers and line breaks if I am pasting in part of an article.