Personnally I did it properly with my 1st character, then some quests on my second, and on my third level 50 character I never start the storyquests yet, but i can play everywhere, and i'm CP200+ without these quests.
No need to do this, as stated above, but each quest gives a skill point, and at CP160 they added a blue Truly Supreme glyph, making the reward a little better.
PC/NA/DC
Breton Sorcerer Maester.White - BB meets GoT >Master Crafter< { 9 Traits completed 4/23/15 } TANSTAAFL--->There ain't no such thing as a free lunch.....Robert Heinlein Women and cats will do as they please, and men and dogs should relax and get used to the idea....Heinlein All those moments will be lost in time, like tears...in...rain. Time to die. "Blade Runner" ESO: the game you hate to love and love to hate....( >_<) May RNG be with you (*,_,*)