Recently just joined Bear. I stopped using Evernote awhile ago because it was too bloated, and just stuck to Text Edit on Mac for its pure simplicity.
So far I love Bear, but just wanted to echo David's point, that highlight and text color options are a huge miss.
I work as a designer, and I rely heavily on color coding my notes and workflow (especially when handing off notes to my producer and team). This was a pretty basic function in Text Edit, and I feel like it should be it should be considered for future updates.
+1 to adding a feature to highlight an inline section of text or otherwise make it stand out visually.
The need that I and other users have here is different from making something a H1 for example. H1 impacts the full line of text and has a different semantic meaning if you consider things like future TOC features. Instead, the goal with highlighting is to help bring our attention back to some key idea within a note.
One example use case for this is to be able to identify for yourself some key ideas in a note that need further attention in the future.
Highlighting and colored text, kind of go outside of the idea of markdown not being used for presentation, but I understand the reality is people do use it for notes, not just for writing (hence the app name). So this would need to be an extension to commonmark.
It may be useful to add a theme which highlights underlined text as a suitable compromise.