And in many cases the warnings are there because the law comes down hard on manufacturers that enable bypassing the (mandatory) governor systems which limit the speed (and sometimes the torque) at which the vehicles can operate.
Yeah, but warnings like that confuse owners about what their rights are. I'm starting to think there should be a penalty for businesses who assert rights beyond what they actually have.
You're free to ignore those warning stickers because the onus is on the manufacturer to prove that you opening the device caused the issue. Warranty stickers are a scare tactic.