other8026 of course unlocking your phone with pin or password would stop someone from enabling it again. right now we only have the option to completely lock down the phone. this disables notifications aswell and is not suitable for everyday use.
for people crossing unsafe environments, there is a need to quickly disable less secure unlocking methods
there are already discussions about fingerprint unlocking timeouts, but i don't honor this option as much, because most people can't predict future enough to schedule their device security.