Two reasons one may prefer an outlet to a hard-wired solution come to mind. 1) 14-50 outlets are fairly common at campgrounds, for RVs. I like having an EVSE I can bring with me when I go camping. I don't have an RV, but I do like to be able to charge my EV overnight. 2) If you rent or otherwise don't plan to be in a location for too long, a plugged-in EVSE is much easier to take with you. This doesn't apply to me, but it certainly applies to some. Another reason for me, is that I have family members with an RV who occasionally visit. Now that I have an 14-50 plug, they can use wall power to run their RV instead of needlessly running a generator in my driveway.