DEV Request: Please do not make DRK a 1-2-3 like PLD was

[Ultimatecalibur]

I don't think you're getting the base argument here. It is still, regardless, one combo now. Hard Slash combo is nearly never used

That may be changing with the serious reduction in tank enmity generation relative to dps/healers. Just spamming the dps rotation might not be enough to hold hate even in tank stance. You may need to occasionally toss in a RoH/PS/BB combo in order to keep hate.

To be clear, the issue is not really the number of combos, it's the number of purpose.
WAR will use BB for enmity, Eye for Slashing debuff and Path from buiding Beast.
PLD will use RoH for enmity, GB for DoT and RA for instant DPS
DRK will use PS for enmity and every other combo for pure DPS

I'd argue that the situation is slightly different than what you make it out to be.

Paladin has "2" weaponskill combos: An Enmity combo (FB -> SB -> RoH) and a dps combo (FB -> RB -> GB/RA) that is modifiable based on current needs.
Warrior has "2" weaponskill combos: An Enmity combo (HS -> SS -> BB) and a "dps" combo (HS -> Maim -> SE/SP) that is modifiable based on current needs.
Dark Knight has "2" weaponskill combos: An Enmity combo (HS -> SpS -> PS) and a dps combo (HS -> SyS -> SE) both modifiable based on current needs.

All 3 tanks have 6 buttons for their combos (Dark Art being considered part of the Dark Knight's combo suite for this purpose).