Stone and Great. the answer is heat.
performance wise yah that's totally stupid, the regen is a must imo, in perf mode and once you really learn how to use it, a gamechanger... again jmo.
but im thinking, the sport mode is really stomping the C rate on these batteries and is going to create quite a bit of heat in them, which is going to be an issue. now letting it throw another 0.5C or more back into it via regen, in out in out in out is going to give them even more heat to have to deal with. They are doing whatever they can to keep the heat down, and probably have the mindset, aka STREET fighter, it's mostly straight line running, not a lot of back and forth like a track / moto racer would be or need for the regen at the end of the run.
That's kind of ironic in a way. Street Fighter GRRRrrrr!!! Naked Racer, Woo Hoo !!! but the flat front end of the thing's got the aerodynamics of a fucking brick. SOME Fairing work would go a long way for actually winning that race

Those fairings help a ton especially up there. The Ribelle it's a rough time getting thru the 140's with the open front end, the EGO now, with fairings 160s is doable pretty easily
Aaron