I would also think that in the tropical environment the real colour of the tanks would remain effective for longer than in NATO's usual environment (northern snow down to med climate).
And at least the turret remained "relatively" clean even after some weeks of operations.
And while we also use camo nets I still have the feeling, without being able to support it apart from subjective feeling, that a multi color camo pattern still works even when one uses stuff like camo nets and natural vegetation (And we put whole trees onto our tanks sometimes...
).
ID could be a factor and seems to be a reasonable idea.
FF is a problem and much more so during a crisis when a conscript army has to fight for it's country.
We had our share of FF during maneuvers. I don't want to know how bad it becomes in a real war.