Porsche might have a unexpected sales problem with the Mission E,.... it might look too good.

Consider that Teslas do not look remarkable or ostentatious in anyway, that in itself is appealing to many purchasers. It has no social stigmas attached to it or notions of high priced servicing, while Porsche does with some people. I can't see that many Tesla buyers switching to Porsche just because it is a Porsche.