Earlier quoted context omitted.
So you think a Popup "Hey you're battery is going bad. Do you want to [keep the performance] or [save the battery life]?" Would be too much??
Multiply this idea times the six thousand other locations people think this should be done and you suddenly get an frustratingly unusable device. Everyone gets upset that their pet setting isn't available, but nobody stops to think about the consequences of having everyone else's pet setting available.
We can argue all day long what is and what really isn't important. The fact is they decided it isn't and the backlash showed quite strongly that it was wrong.