Honestly, all jobs are simple two combo rotations at this point, yet DRG is the most punishing of all of them. We have 4 positionals but in an 11 GCD rotation we have 6 of them. The only class worse than that is monk, however monks potency loses if they miss are much less severe. You miss a HT that's 45% potency reduction. You miss a WT or FC that's a 31% potency reduction. Most of monks potency reductions for missed positional are in the 20% range.
The other point that the OP fails to realize is the massive amt of oGCDs you have to line up just right so you aren't sitting on your LoTD.