Honestly, no real answer for that. The only reason i can see for it is because HPI's own lipos are all deans ready, so for convenience.
Now wether the deans can cope with the load without melting over time, is another question. If that deans heats up and melts the plastic casing and the connections touch... well you see where thats going
They tend to melt in the middle of the housing with constant high amp draw.
Real deans are only rated to 60A constant if i remember. But i suppose, if HPI put them on an 8s capable RTR with a motor that can pull 200Amps, They must be good, right?