Yes. The preview feature will also be removed in the future, and the editor is intended to be fully WYSIWYG. It will also need to support custom emojis… implementing all that on a plain HTML textarea would be quite difficult for me, so the rich text editor is a must.

As I understand it, line breaks when copying shouldn’t be an issue anymore. If they still are, then my understanding is wrong — which could mean there are many other potential bugs. So this bug might actually be important.