Many do use the motors to recapture power which does slow the car. It’s very effective and reduces brake wear to the point Teslas need their brakes greased every 6 months because they’re used so little.
You don’t want opposite tire spin because once you’ve broken traction, you have no directional control. If you’re doing 70mph, you don’t want your tires spinning freely while in a panic as the maximum rate of slowing is limited to the tire’s traction.
Your wheels generate the most force when they are *just barely slipping*. If you graph the two, it looks something like [this](https://www.hondata.com/help/tractioncontrol/wheelslip.gif).
When you slam on the brakes, you want your wheels to just barely skid. Too much skid means you get *less* traction. Spinning the wheels the whole wrong way means *even more skid*.
In a traditional car you’d have an ABS system to ensure that your wheels get the right amount of skid. Teslas have even more advanced systems, and other electrics may as well. These get the best possible traction, which again, means almost no slip.
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