Like a few others have mentioned already, I find the biggest problem with the remote holds is the impossibility of predicting with any degree of accuracy how much fuel you will burn from the hold to touchdown. The frequent level offs at intermediate altitudes and the early speed reductions which necessitate flap (and even gear) extention far earlier than you'd like to make for a higher fuel burn on descent into Dubai than just about any other port in the EK network. (I have to say 'just about', as Singapore is lately giving Dubai a run for its money when it comes to marathon cross country vectoring on approach.)
Committing to destination seems to be the way the powers that be are content for us to go. It would seem that the risk analyses done by these people at the top have shown to their satisfaction that it's quite acceptable to fly a succession of closely spaced wide body aircraft onto a single runway with almost every one of them on close to minimum fuel and committed to landing on that one runway.