Lenovos etc. don't care, but I've seen this first hand with some Acer and Asus laptops. It has nothing to do w/peak power consumption, that is a wholly different problem, of a different class of devices.
some Lenovo devices do throttle though. If you do not have a battery and are using the 65W not 90W lenovo chargers on an X220, it will throttle your power.