Thermostat or not?
No myth here! No thermostat, and you will run hotter than running say a 160.
You need something to keep the water in the engine long enough to pull the heat out of the engine. This is why the thermostat opens when it gets to temp, and flows back into the radiator to cool off. It doesn't have to be a thermostat, you can put a restrictor in place to control water flow. This is done on most race engines.
Regardless of how you do it, you want to control engine temp weather your computer controlled this will give you your best power, and life out of your engine.