I think that's a flawed argument.
On older helicopters, and some current ones (Robinson R-22, for example), you have to manually control the throttle in order to keep the rotor speed within the proper operating range. All (almost all?) modern turbine powered helicopters do this automatically. There is a "throttle" in name, but it does not require adjustment during flight. On the Ka-50, there is no twist throttle, there are throttle levers...one for each engine. When you start the engines, they are in the lower-most detent, called "IDLE". After the engines are started and warmed up, you move these levers up to "AUTO", and you're done. You never touch them again unless you lose an engine or you land and you're ready to shut them down. The Mi-17 and Mi-24 have a twist throttle, but again, in normal operation, it's all the way left for "IDLE" and all the way right for "AUTO", and it's never touched in-flight unless there is a problem. If the rotor RPM needs to be adusted, there is a seperate incr-decr swtch for that. (The Ka-50 also has an incr-decr switch for rotor RPM, sort of. It's on the collective.)
The fuel controls on modern engines automatically adjust fuel flow rates to keep the rotor RPM within a certain range (or at a specific percent), so the pilot does not touch the throttle during flight except in case of some kind of emergency. And "I need more power" is not that kind of emergency, I'm talking about the failure of an engine or the overspeed of an engine.
In other words, the helicopter is way smarter than the pilot at determining how much fuel to put into the engines in order to keep the rotor RPM where it needs to be. To try to compare it to a car throttle, you'd have to assume that the car is permanently set on cruise control for a specific speed. Once you set the cruise control, you never touch the throttle again until you turn off the cruise control. During "cruise", your car's computer determines how much fuel to send into the engine in order to maintain your set speed. Now imagine that this "cruise control" is always on, from the moment you turn on your car, until you turn it off, and all you can set your throttle to is "IDLE" and (for example) "50km/hr", then that would be like a helicopter's throttle.