Dying is the equivalent of healing back to full, it just takes a little longer. If you're on the other side of a big map, and you spent all your boost getting into a situation where you need to retreat, it takes about as long to heal as dying and having a medium-respawn timer.
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That would make Strikers the most useless class, ever.
Although strikers are made insanely fast by their boosters, the booster does run out. If they're stupid enough to boost all the way back to their base after every pip of damage, then that leaves whatever CP they were guarding unguarded for at least eight seconds at my last estimate.
Regardless, a boosting striker that suddenly runs out of boost will find him-herself very vulnerable, due to the loss of max HP and inability to use defensive maneuvers.
I don't think it's that Strikers are OP, it's that the people using Striker class are the 'OP ones'. They're strong, they have skill, so they screw tactics and just go for the fastest hard-hitting class there is; Striker.
Recon can be equally devastating. Going invisible only to appear in random spots around an enemy is enough to drive them crazy. I've seen one do that with a WRH, it was really disorientating. I died in less than two seconds (Then again, I suck).
But disallowing the Striker to heal is going to completely kill that class. That would mean the average Striker has the life span of two swordstrokes, so pretty much when they get hit, they're screwed.
Although tbh, they could probably just switch class, heal, then switch back.