I’ve never had a problem with regen in any conditions. In fact I’ve found it slows the car better on snow that physical brakes, although that may have more to do with the ability to slow the wheels with a touch more control.
In an ICE car, you lift off the accelerator and nothing happens instantaneously, the engine braking kicks in once the engine has slowed. In an EV, because it’s the electric motor, as soon as you start to release the accelerator there’s a reduction in motor speed. You take your foot off from a position that held speed and the motor immediately stops driving forward and starts slowing the car. In those milliseconds it takes, the level of adjustment between the two systems is massively different. If you slow the rate you lift your foot, you smooth out the rate of change and the speed the regen kicks in. With a little time you can control just how you transition between holding speed and slowing down in exactly the same way you can add just one mph to your speed if you’re careful with how much extra you press.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark