> Unlike copper Ethernet cables, which are very bulky, warm up, [...]

Ummmm warm up?? You're really using it wrong :) Unless you try to really pump a lot of PoE++ power over totally inadequate CCA perhaps (copper-clad aluminium rubbish), it really shouldn't warm up at all.

The other drawbacks are true though.

Ps never use CCA for PoE for anything but patch-length runs unless you like dealing with random brownouts. Unfortunately real copper cable is very hard to find these days.