If practicable, then yes, give individualized, written comments on large projects, papers, etc. But, you can always give general comments, too. Or create a bank of appropriate comments.
Also, video feedback right to your LMS shell works for general comments. You can also record comments to individual students, per Canvas' website.
http://www.canvaslms.com/news/press-releases/canvas-enables-teachers-to-giv....