This is NOT a huge burden. Any robotics company operating a fleet today will have someone watching almost all the time in one form or another anyways. So this really just becomes a matter of interpreting what "the controls" means. The regulation seem to omit any mention of "on the device/vehicle" so these controls can clearly be remote. It also doesn't seem to specify a 1:1 ratio of operators to devices. So if there is one operator, e.g., at the air-conditioned HQ of the robotics vendor, at the "controls" of twenty tractors that are operating in the field which the operator can see remotely using low-latency video-streaming and which he can stop instantly with the press of a button, then that might already be all that is required. It certainly is logically.