Although it's possible to land most heavy jets at their maximum take off weight on the departure runway, it is presumed that all normal landing systems and devices are operative.
Not so in this case; increments to Vref would have to be considered:
No leading edge devices? 20KN.
Reduced hydraulics? 15KN.
Secondary Brake and Anti-skid system???
It appears that system problems restricted the available fuel dump to reduce landing weight so approach speed might have been around 180+KN
With limited spoilers and reverse available you would be taking a really good look at brake energy limits in this situation, usually not well presented in ops manuals for odd configurations! The extra crew would have come in handy. Appears they made a good decision (guess) the armchair experts decided they had 150m to spare, not a lot on a runway the length of Singapore’s.
It will a interesting to know if the blown tyres on landing were due an anti-skid failure or the tyre blow out plugs from over heated brakes.