That could block out anyone not staying at a resort depending on how the day goes. Which would be unfair on others.
Sadly for the short term there will always be some who loose out. Should those who only have one opportunity to experience it loose out? Absolutely not.
It comes down to numbers, which we aren't privy to. Does anyone know what percentage of Studios guests get a boarding pass on a given day?
Assuming resort guests do a minimum 4-day ticket, if they are given one boarding pass what would be the equivalent for other guests that would be fair? One pass per month for a passholder?
It could also make sense given the current restrictions on park hopping. As a resort guest, I'd be scheduling one day at Studios so would only get that one shot. It could help spread crowds out better, after all Studios is the park most often fully booked for Passholder access.