4QDs are tried and tested definitely. RobotEQs are more modern and I am sure robots like Thor use that exact motor and ESC combo.

Ok. So what you're saying is that the cytron would run it but may fail depending on circumstance?
I am saying that the draw from the motors in terms of overall amperage could cause the ESC to cut out. With a bit of preventative modifications (such as putting a vented box around the ESC for example), it should hold up but it is still a relatively untested piece of kit. That being said, I think Tango (HW pusher) uses a Cytron but with scooter motors.