Power on Macbook Pro by touchpad or keyboard

Lately my Macbook Pro has been crashing a lot. During my troubleshooting, I found that I am able to power on the MBP by clicking the touchpad or pressing any key on the keyboard. Is this normal behavior, or is my MBP f'd up?

I only remember that if you shutdown the MBP, the touchpad would not be clickable, and the only way to start it up again was to press the power button. If Apple has changed the behavior, when did this happen? I thought that the trackpad needs power to be clickable, and if that's the case, isn't it draining my battery by remaining clickable?