i love the bleed valves are wank topics, nothing wrong with them in essence.
even an electronic boost controller is a bleed valve (air to air are not the same), it's about allowing a small percentage of boost to not make it to the actuator, therefore reducing force acting against the actuator spring.
if your not an idiot, then you'll only open it up enough so it raises the boost safely enough without spiking/surging too much in a safe environment.
even an electronic boost controller can knacker an engine if someone sets it too high, so no worse than a bleed valve.
the only benefit to an EBC is that you can have various settings and still keep the valve close to the turbo so not increasing the pipe length and therefore keep spikes to a minimum and reducing chance of pipe splits that could occur on longer runs.