When I get a mail notification, the text is one long paragraph and all formatting is lost, and likewise are image missing. This means that I have to go to the thread if I want to read the proper version. But this also means that I can miss something if the text is short and readable, but I don't know that there also is an image.
This is something that matters to me who answers a lot of notification. If I can read the responses, I don't have to open the thread, unless I have something more to add to it.
But this should also help people who have asked a question and who can get their answer without having to open the browser.