This is aside from the fact that he heals himself and others more slowly because of his area healing capabilities. Unlike other medics, Phoenix can’t drop health packs on the ground for teammates to heal themselves with, so you will often find yourself getting stabbed in the face by a teammate who is obviously waiting for health when you’re waiting for your cooldown to end, and possibly getting stabbed in the back by an enemy.
If needs be, the healing power could be reduced proportionally with its cooldown reduction, but throwing medpacks onto the ground also means that other medics can output a larger amount of healing by projecting their healing power to when it’s needed in the future, another reason why Phoenix is outstripped by other medics in terms of healing.
An alternative solution to this particular problem would be to allow Phoenix to overcharge his healing pulse (as in, having a Healing Pulse standing by will gradually add a buffer to the charge, allowing some extra healing to build up beyond the usual level) which would allow Phoenix to bank healing power the same way and also combat the slow recharge when using small pulses.
(I personally would love to see overcharge implemented along with a faster and weaker pulse.)
So, what do you think?