Maybe a general user is okay for himself without command line.
But a good command line is essential for replicating more complicating tasks on more than one machine. I still remember when computer magazines printed a ton of screenshots on how to do certain things. A command line can be short, simple and much easier to replicate.
Fixing problems on windows means watching youtube videos and trying to replicate clicks which sometimes break the version is not the same. On linux, you google the problem, find the fix on stackoverflow and just type a few commands.
Beware that copy-pasting from websites may not be safe!
But a good command line is essential for replicating more complicating tasks on more than one machine. I still remember when computer magazines printed a ton of screenshots on how to do certain things. A command line can be short, simple and much easier to replicate.