[benj111]

Why only high performance though.

A motor per wheel simplifies everything.

No diff, no CV joints, you don't need this, just a simple planetary gearbox.

You gain space, lower manufacturing costs (theoretically, assuming multiple motors doesn't offset the other cost reductions, although as you could base a 2wd and 4wd high performance version on the same motor, that's an even harder case to make).

[lstodd]

Everyone says "unsprung mass" but you also have to provide cooling without ingesting all the dirt and water off the road. It's not that simple.

[benj111]

Brake lines are a solved problem. Water lines wouldn't be any more difficult. If air cooled it could be a sealed unit.