@Chameloshi: Probably not useful against humans, we're made out of too much water that requires a ridiculous amount of heat to actually burn. Since our vital organs are all inside you'd need a lot of energy to get down to these to damage them.

@NotMeNotYou: Lasers would, however, be very useful for applications like intercepting missiles, which is a huge goal of the tech

They are also used for things like igniting drugrunners' boats. You can start a fire from miles away without being obvious