There is no substitute for airmanship and two experienced pilots upfront who have the healthiest respect for ITCZ weather.They steer well clear and they dont wait for ATC either(very often VHF will be temporarily lost due static and some guys want to keep the magenta line until they get clearance).
They must have flown very often to 'straya and got hollered at so badly by the very anal ybbb atc that they became psychologically damaged...hence the suicidal propensity to follow the magenta line into cb cells until they get the clearance to deviate!
Ybbb atc strikes great fear into Asian airline companies so much so pilots get severely punished for deviating without clearance!