Like anything it depends on the situation. It works well for some people and subjects but not for others.

Last semester I had a student in my online class that was every tech illiterate. There was an assignment where they were supposed to download a file, fill in the blanks and submit it. This is something that should take no more than 5 minutes. The student couldn't figure out how. I told the student, "you can just print it out then take a picture." Come to find out the student doesn't have a laptop or desktop computer and was trying to do it on a phone. I look at their schedule and they are taking all online courses. That person should not be taking online classes.