Too much sun may not directly cause less blooms but it may cause the plant to lose foliage and thus vigor, something that you have not mentioned so apparently the shock to the system from full sun has not had a measurable effect yet. A hydrangea that gets too much sun will develop leaves that are completely yellow, including the leaf veins, only on the leaves that are in direct contact with the sun. Leaves inside the shrub will remain dark green.

ES normally have two flushes of blooms: one in spring and another in late summer/fall. The spring flush only originates from stems that were alive in summer 2021. The late summer/fall flush only originates from the stems that started growing as new stems in early spring 2022. If you pruned since ES developed flower buds in summer 2021, you may have cut off the early spring 2022 blooms or caused a delay or no blooms in the second flush. The blooms from the second flush occur in late summer to early fall so those may still be somewhat on schedule; hard to say this early. In order for the second flush to occur, the new stems that started growing in early spring from the crown/base need to attain a sufficient height to trigger flower bud formation and immediately open those flower buds.

Other possibilities: late frosts, very cold weather or inconsistent warm weather in winter may have made the plant break dormancy early, just as temperatures crashed and killed the summer 2021 flower buds that were supposed to open in spring 2022; too much fertilizer or use of a fertilizer with large amounts of nitrogen can produce deep green leaves at the expense of blooms; pests like deer, squirrels and bunnies can eat the flower buds.

Looking back, we DID have a very cold Winter (dropped down to 18 degrees one night), and I had a lot of dead wood with no growth that I cut back in early July. So maybe I'll see blooms later in the Summer.

Thanks for the info!