Okay, since you don't like polite "what's the use" questions, I guess I'd better stick to the answer instead: There is no use to change the profile, ever. Sorry if this seems harsh, but that fact was already raised politely, and you dismissed it.

When the profile is set correctly for your device, it will run without crashing at any speed. Want to limit power consumption near the end of battery life? limit the speed. If you drop to a lower profile, it will crash. If it doesn't crash, then you should have tuned your original profile tighter.

It's really that simple.