Well, to be more specific, we thought we might end up with 2 EVs in the garage at once -- one being a Tesla and the other not. Then of course we would have to share power but honestly, to me it's not a big deal, nor is the relatively slow charging speed of NEMA 14-50. In the year and a half that I've owned my MS, not once have I ever been put out by "slow" charging speed. It's never even been close to an issue.
Having said that, I paid my electrician ~$900 to have the outlet installed. It has, however, worked flawlessly. I see the wall connector costs $495 -- no idea what it would cost to install it. Of course, the mobile charging connector came with my car, which I guess is no longer the case. You could just get the wall connector if you're only worried about charging a Tesla. But I do like the peace of mind of having the mobile charging connector in case I ever go some place that it could come in handy (hasn't happened yet).