The only real use-case I can see here is getting access to multi-select, and find/replace utilities, or perhaps other custom shortcuts you might use. Overall a neat little trick. Atom is not my usual editor of choice but I could see a few small potential use cases.
I wind up copying text into Sublime all the time to do my formatting then paste it back into my browser.
Things like GitLab, GitHub, Bugzilla, Wikis, etc.
You have a comma separated list of strings like
"one", "two", "three", "four"
and need to turn them into Markdown bullets
- one
- two
- three
- four
I usually copy-paste longish things to the text editor (or at least to clipboard) to avoid data loss in case the webapp crashed / browser crashed / HTTP request failed / I mistakenly pressed backspace when out of the textarea (which navigates to previous page)
Yup, neat little trick. Also, I think this might be useful for answering or asking question on StackOverflow. Gods knows how hard it is to format your codes properly on those sweet little box.