Tesla initially set the regen and power limiting to very conservative values. Now that they have years and millions of miles worth of data, they can start to move the goalposts a bit, which is what we're seeing now with the changes to when regen and power are limited.I'm not sure if I should be happy, the excuse they had for software limiting regen like that in the first place was that it would impact the longevity of the battery if they didn't.
This is similar to how earlier Model S's were "uncorked," and how they've been able to unlock additional power from existing motors on the Model 3; they've collected the data showing that they aren't pushing the limits yet, so are cautiously and carefully giving us more power. I believe they are doing this very cautiously, as they would hate to have to issue an update that reduces power. Certain Model S owners with certain battery packs will tell you exactly how much they enjoyed having their capacity reduced!
IMO, we will continue to see more updates regarding total motor power available, adjusted regen and power pulling points as the fleet continues to contribute data to Tesla.