So Why assume removal of Classes?

[lololink]

Chemist was a job that mixed up items in actual combat.
But given Yoshi-P's stand on combat-based classes not using consumables for their skills, then it's unlikely it'll happen...unless it's altered in some way.

They don't have to use actual items, ninjas don't use items to throw shuriken as they usually do.

[Exodus-E]

They don't have to use actual items, ninjas don't use items to throw shuriken as they usually do.

Yep, hence the "altered" part in my post.
The way I see it, they could pull something similar to the Ninja's Mudra combinations, except with non-consumable items.