The capacitor(s) are there solely to push and pull the FET Transistor gates shut, when the FET starts to get warm. Thats why the FET needs to be as close to the +ve and -ve terminals of the ESC, the further away, the more/bigger the cap needs to be. You can run them without, if the application isn't to power hungry, but if you are pushing the limits, to help with ESC temps, you can add more.
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