-2.0 degrees front camber is not needed for street driving. The tire wear may not be too bad, but if you do a lot of mileage you will eventually notice the tires wearing unevenly. For people who are focused on some type of motorsport, the tire wear normally isn't an issue as they generally don't do a lot of street mileage anyway.
IMO, around -1.3 to -1.5 degrees is about the maximum front camber you should intend to use as a dedicated street alignment. It will give a lot less understeer than stock. For increasing camber, it is a case of diminishing returns. More camber doesn't automatically give better handling. My advice is to avoid going over -1.5 degrees front camber if the car is setup for street use unless you have a good reason for doing so.
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