Really depends on how quickly you want to level. With beast tribes and custom deliveries alone, you could level any crafter without ever needing to go gathering materials ever again. Restoration does require gathering, but the Skybuilders materials all have frequent high-yield procs. Leves and GC turn-ins, and you're kinda back to possibly needing some of those timed materials (maybe? Idk, maybe some/most turn-ins avoid those).

Even better, after 60, you don't even need to gather materials for class quests.