It's not about the math. It's about how an odd man out episode in the middle of a story arc is perceived and I think there will usually be a personal element to it. I love
AU stories and that one pushed all my happy buttons. Other people love baseball and I think they enjoy seeing a baseball ep the way I enjoy seeing a Trek ep on a show that isn't Trek.
The could have inserted an episode like Sub Rosa to the Dominion arc or the Xindi arc and everyone would have cried foul.