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I use Sumatra frequently, and while it's great at what it does, there's a lot it doesn't do. It's strictly a viewer only, so it doesn't even have rudimentary annotations like highlights or underlines. As an epub/mobi reader it's even more lacking. It won't allow you to search for or copy words, despite being able to do so with pdfs. Also, there are some azw3 that are effectively mobi, but Sumatra won't load them unless you rename them with the mobi extension.

>It's strictly a viewer only, so it doesn't even have rudimentary annotations like highlights or underlines

SumatraPDF supports basic annotations as of version 3.3 https://www.sumatrapdfreader.org/docs/Editing-annotations

Only for PDFs, not for the text based document formats. But yes, you're 100% correct!

Can't be agree more I use Sumatra every day

I moved from Sumatra to okular because the latter has more features and is not perceptibly slower.

Not multi-platform, unfortunately.