Supercharging should be free for all Model S and X forever.

The latest referral promotion for free unlimited supercharging is confusing and half baked especially since it introduced (and then shortly after eliminated) a new class of owner-tied unlimited lifetime supercharging.  Ultimately, Tesla should just make supercharging free for all Model S and X forever.  This maintains a distinction between Model 3/Y and Model S/X, encouraging Model 3/Y owners to upgrade to Model S/X when they have the means to do so.  If Tesla doesn’t make this change, there could be gray market sales/transfers of Tesla accounts and other abuses.  More importantly, existing Tesla owners could defect as more non-Tesla long range EVs hit the market and as 3rd party, paid charging networks expand.  Free unlimited supercharging could tip the balance for Tesla owners to stay with Tesla.