You know, of course it differs from the usage you have. For my part, I'm also just writing notes. When they get longer, I have to make sure these notes stay readable, so I add an extra space between paragraphs. Sometimes, these notes transforms themselves into articles that might get published. So I use the very handy Url-Sharing functionality to give access to my note-turned-out-article to editors so that they can access the live-updated-latest-version-of-my-note-turned-article. If it's good, they will copy-paste it to their InDesign or whatever program they use. And guess what? I addition to the default paragraph-spacing of their Indesign or other program, my duplicated additional space-between-paragraphs appears! That is obviously a problem. Same problem happens if I paste my article directly from my Evernote to Microsoft Word or similar.