Unless you are a completionist, no. It is not necessary.
While making unique recipes will give you a decent exp boost it is my personal opinion is that it's more headache with all the things you'd need to hold and get just for the sake of making those items.
I leveled all three of my DoL classes using only the gear they gave to me through the class quests and didn't even bother with accessoires until the later levels where I made more use of my GP in some of the leves, at level 50 I did go for the HQ sets though.and... If I can gather okayish with my DoL until level 50 despite not using crafted HQ items with them.
But for leveling up DoL NQ gear suits just fine!
For crafting on the other hand you will want to invest in HQ gear. (It'll pay back in the form of materia later as well.)