It wasn't battery life, it was stability. The day Apple brought out the feature toggle for you to choose whether you wanted to throttle your device or not, I turned the throttling off. The phone was as fast as when I got it again.
That same day the phone crashed, a first in a long time, because apparently the power draw was too high for the battery. Imagine if, instead of throttling, they had phones crashing left and right. I think throttling was the right choice, but they could have been more transparent about it.
My Pixel that crashes randomly whenever I'm below 15% battery makes me wish that Google would have made the same choice (I'm certainly making some assumptions).
Uh, yeah it was. Older batteries couldn't support the peak power draw, so Apple responded by throttling the CPU if necessary. Unless you have something to share?
Look back through the issue. People started getting throttled within the first year when they still have 90+ percent capacity left. That's not an "older" battery.