> What are the other limitations I should know about?

It's completely inadequate for anything more than a memo or simple single-page note. Which is fine for many purposes a typical software developer encounters but quickly gets left behind for anything more.

It's exclusively a markup language, completely lacking in semantic meaning. If you're trying to write an actual document, the title is the title not some bold text in a bigger font, for example.

Like a hammer, it's a great tool for certain jobs. So many people assume all their writing tasks are nails.