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You probably won't see shops taking apart a motor to fit a different stator for performance gains like you might change the rotating assembly or cam in an ICE. The closest comparison would be swapping out large system components like motor/inverter/batteries, or changing reduction ratios to optimize for acceleration vs. top speed (not sure how many people are running the salt flats with EVs right now).
Whether you can "tune" and EV vs. just putting a more powerful motor/inverter will depend on how much potential the OEM leaves on the table. If the OEM engineers the vehicle to utilize all of the potential of the powertrain components there might not be any opportunity to tune the system, but if they over-engineer it or just limit it for reliability you might be able to squeeze out some extra performance. An example of this would be the Tesla Model 3. Those cars are software limited depending on what you pay for, so there are and will be people who software tune to get the extra power/range at the expense of reliability/warranty. That could be said to fit in the same category of modern tuning that brian_ mentioned above, but that's a different debate.

The other side of the coin is that most of the people on this forum are ev "hot-roddders" anyway. We do exactly the same stuff that the ICE hot rod community has been doing for 100 years, just with a different type of powertrain. With that in mind, "tuning" is never going to die. It just looks different. The hot rod and race shops will live on making great custom cars and pushing the OEM and aftermarket EV industries. The guys in their garages will also keep tinkering with their cars, even if the OEM stuff becomes less conducive to tinkering.
 
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