Agreed.
ECT started as simple Electronic Control Transmission logic for Toyota/Lexus back in the day. The transmission algorithms are more sophisticated today, so while ECT still manipulates transmission logic, it's now a term on its own rather than an acronym, but loosely can be interpreted as Electronic Control Transmission Power
It does several things
- Changes and raises shift points under acceleration, holding gears longer
- Holds gears longer under deceleration/engine braking
- Firmer and more positive shifts, likely with increased hydraulic line pressure
- Increases engine response, by raising throttle pedal to throttle body map aggressiveness
For our cars, it effectively is the tow/haul mode button. It's effects are distinct but can be subtle. As it has utility beyond just towing, like "powerful acceleration and driving in mountainous regions" per the manual, it's disguised as a poorly branded ECT PWR mode button.
I do use it when I tow and makes a good difference with my larger trailer. When not towing, I find the mode aggressive, making driving a bit hurky jerky, loosing acceleration and shifting finesse.