If people are running out of space on their controller configurations then they are doing something wrong or haven't fully learned how to set up hotkeys. I am also a controller user and I have easy access to:

Hotbar 1, the primary hotbar.
Hotbar 2, for infrequent things like summoning, protect, chocobo, etc. Manually access by a single R1 tap (second R1 tap swaps back to 1). Also has misc things like 1,2,3,4 markers.
Hotbar 3: I Access by holding both R2 and L2 for easy immediate access to another 8 buttons, and can be set up for an additional 8 depending on which trigger you held down first (R2+L2 or L2+R2)
Hotbar 4: I set up for access by double tapping L2 or R2 to access this. That's another 16 buttons right there.

So 16+16+16+8+8. That's up to 64 easily accessed buttons. If I can fit everything necessary for a paladin, you can fit everything on a dps.

Also put a minimum ilvl for leveling dungeons. I've also fallen victim to people's lack of gear knowledge or intentional negligence.