Well, you don't need to tune them because that is what they do. Why can't you fix one? It's a perfectly ordinary carb with an actuator to control the fuel mixture and maybe a switch. It's got diaphragms, a metering valve and check valves just like any other, it's just the mixture needles that are not there.
What are these "things you could do on an ordinary saw that has a carb", other than make the mixture wrong?
Or make the mixture right, which is possible outside the MT framework.
What happens when the selonoid goes wrong, how do we diagnose this, or over come it without
a trip to the dealer, when an ordinary saw has a much cheaper carb on it that one can simply swap
out to get you going.
And why have people actually put standard carbs on these MT saws, and left the selonoid dangling
so as to keep the engine from cutting out, and what is going to happen to that dangling selonoid
when it no longer gets lubricated with the fuel nor has any environmental protection outside of its socket,
what happens when that coil goes out, and thus the controller that is embeded
in it goes too, can't very well replace one without the other.
Am not expecting anyone to follow my ideas, just saying when the chips are down
its much easier to keep an old style saw up and running.
Bad design. Seporate the components, open up the code, and price the components
to make them cheap enough so people will support the system, otherwise watch as
those who give the system a go eventually get burned and jump ship.