Or they figured out that it’s more efficient to skip the pre-battery heating and limit regen initially instead of preheating and having greater regen the first few miles. They did say the recent update would increase efficiency. Preheating the battery for a few miles of regen is probably not ideal from an efficiency perspective.
IMHO the proper way to implement this is a 3rd option under regen braking for "efficiency maximization" or something to that effect. Let the end user determine if they want it that way or not and default it to the standard but give those fringe outliers the ability to tailor it to their weird wants. They basically did this already when they added the ability for a few users to mimic the lower regen of an ICE car at the expense of efficiency so why not do it for the other side of the spectrum?
Personally, I don't care about a slight uptick in efficiency for the beginning of the drive it it results in such a jarring and varying driving experience.
In fact, I would like them to expand upon this so that people like me who live in colder climates can have the battery pack warmer when we set out so that regenerative braking is available at normal amounts from the start. On daily commutes where you use 10-15 miles this slight decrease in efficiency when your car is easily capable of 20x that distance is kind of pointless.