I don't have much experience with those jobs in particular, but the placement of the hotbars themselves is universal among all jobs and adjustable via HUD Layout. Beyond that, the placement of individual actions on the hotbars is also adjustable. I don't think anyone expects players to just use the buttons in their default positions; the default positions seem to just be the actions occupying the first available slot, whereas the actions themselves become available in an order that expects them to be linked together in various dynamic orders at various levels.

So you're supposed to customize all of this to your liking.