Can you provide more detail on the physics?

The brake lights come on when decel reaches a particular rate, which means it comes on when regen kicks in. Perhaps try driving one?

The engine braking on my 500cc bike is as aggressive, if not more, than my car. And that one’s got no decel based brake lights.

That’s really a driver problem not a car problem. You’d see the same behavior with a manual car in front too. I’ve got a Y and it’s the easiest thing in the world to keep a set distance with the guy in front.