I'm always willing to learn, so this is a good faith question. I fail to see where the advantage is to having a 'low regen' setting, vs adjusting the regen via the drive pedal. I mean the entire point of the drive pedal is that you can adjust speed and torque (positive and negative). If I want less, just push it less. Kind of like the volume setting for the sound system. If you want it less loud, you adjust it lower. No need to limit the range of the slider.
I do see one situation where I want zero regen. In very slippery road conditions. If you start to slip, the normal reaction is to instantly take the foot off the pedal. That makes regen kick in and the negative torque is most likely causing the wheels to slip more. Free rolling would be the best to regain grip. I know this situation from personal experience well. But outside of that, why would you limit the maximal available regen if you can adjusting perfectly with your foot?
I often hear this from people who recently came from ICE vehicles and their muscle memory from years of driving ICE is to let go of the accelerator. They just always let go of the accelerator and don't like the car slowing down. It also has to do with people thinking that coasting is some magical type of motion that costs zero energy and it would be better than regen as regen isn't 100% efficient. I won't even attempt to unpack all the false thinking here...
But again, I'm open to learing. Why is limiting the maximum amount of possible regen vs using the drive pedal better?