All DoH are interdependent on each other. There is hardly an item worth crafting that does not require components from 3 other DoH and 2 DoL for materials.
Then there are the DoH cross class abilities, which are essential for end game crafting.

This Post has some great advise for new crafters.

When levelling up there are two approaches, level one craft at a time or level them all together. All DoH share all gear except tools so every class at the same time is better on your inventory.