If, like me, you often need to charge to 100% for your trips, then you too probably hate how the regenerative braking is much weaker or non-existent at those battery levels. It got me thinking about my days working for General Electric on diesel-electric locomotives. These things use their massive electric motors to slow down just like electric cars, but they don't have batteries in which to store the generated power. This system is generally known as dynamic braking.
Basically, they dump all that electricity into a big resistive heater. So that got me thinking - could we ("we" as in, "electric car designers", not we as in car owners & tinkerers) add a resistor grid to electric cars to act as a place to shunt generated electricity when the batteries are too full or too cold to accept the current? The main benefit would be that "regenerative braking" would always feel the same, so no surprises for the user. A secondary benefit would be less wear on the brakepads. Resistors shouldn't be expensive, but the electronics & controls for deciding where to shunt the generated electricity could be. And then there's the question of how to control & dispose of the heat that would be generated.
I'm guessing that the complexity just isn't worth the cost, but wondered what other people thought of the idea.