Nope, not necessary at all (or recommended), but I once did the whole 4 hour with no clutch lever - so clutchless up and down shifts all day! Veeeeery interesting day....
As Jamie said, it's a useful skill to have in your bag of tricks, and also contributes significantly to your overall mechanical knowledge. If you know how something works, you know better how to ride so as not to hurt/break it.
Bookmarks