i applaud you brave guys to test this stuff heh. kinda like those guys who cut the antennas off their receivers i guess.. the cap is there to smooth the power and prevent massive voltage sags and bad ripple currents. esc is quite sensitive to this kinda stuff and might shut down under a brutal load like a mod motor or stock motor poorly tuned. add in fans and a powerful servo and it might be a bad time.. i guess if you have the most tits batteries all the time you could get away with it.. ill tpyically run a LARGER cap to try to take some of the strain off the batteries as chemistry isn't instant.
ill also add that my experience comes from the older hobbywing 3.1 and xr10 series. those i would use a larger cap to get a bit more punch without sacrificing batteries.. the new orca escs i use now have TINY little caps.. kinda similar in size the current hobbywing sport caps ect. i dont really see any reason to delete somthing that small. esp if it comes preinstalled as it does on hobbywing.