You obviously do not live in a cold country. iPhones up until version 5-6 or so (when this was introduced) was notorious for turning off at 25-30% battery if it was slightly cold outside (sub 5 degree Celsius or so). It was a horrible experience that was completely slowed by clocking down processors of battery worn phones.

I’ve never heard of a person turning off the option now when we’ve got the choice either.

It’s 100% beneficial to the customer.

Though, they should’ve been clearer with what they did and added a toggle from the start. Which is why they were fined.