The issue is that unlike Teslas, most other EVs cannot use a naked 14-50 or any other standard plug other than a L1 120v outlet. Other EVs must have a "Charger" (effectively, what our UMC or HPWC is) that has a J1772 on the end of it. Those chargers are almost all universally hard wired.
Tesla is the only EV out on the market at the moment that one can buy different adapters to plug the UMC into almost any standard electrical outlet. It gives Tesla a charging flexibility that is unique in the EV market, and I think entirely underrated and often overlooked.
Most of my driving would be impossible if I was limited to J1772 charging only.