As someone else said, generally the requirements in Washington that state government imposed on non-government entities was masking. Vaccination was encouraged but not required. It was required for various government employees.
Washington ended up being one of the 10 states with the least COVID deaths per capita.
Many private functions/companies required both. It's simply counterfactual to say there were no vaccination mandates--and they weren't limited to healthcare settings.
To pretend that those private mandates were independent of what government at various levels was saying is counterfactual. It's not like individual companies were just making up policies in a vacuum. If governments were saying (almost certainly incorrectly) "Hey, business as usual" companies would have acted differently.
Washington ended up being one of the 10 states with the least COVID deaths per capita.