Apparently, they wanted to give him a day every now and then to start since he didn’t have any ST. But that doesn’t really make sense when we have a day off tomorrow anyway.
The real answer is that Snitker can’t resist playing Rosario.
They had this same approach every year he was the hitting coach since 2018, minus last year when most of the lineup was hurt. They didn’t just suddenly change their hitting philosophy last year.