It would be quite beneficial to have the POE watts and/or mA show up in resource graphing on the POE enabled devices. This would be quite useful on towers using solar power.

Would also be useful for DC powered devices that run from solar power (like my 912).

some mikrotik devices have a power measurement hardware included

unfortunately only high-end ethernet router models,

this function is called current monitor

in the case of poe devices is more a common case that poe switch supplying power to the access-point or other devices is which do that measurements, maybe thats the reason not to do that measurement again on end device