I certainly understand the principle there. The only issue is with how the analytics can take into account the conditions in play in that specific game. Such as the fact that Anderson had clearly been struggling in recent outings.
Alex Speier (who said that pulling Snell was defensible in itself) said Anderson wasn't the same pitcher as he was in the regular season, and therefore was not an upgrade over Snell, so he disagreed with that part.
I will also say that I'm no longer discussing this for the purpose of proving how wrong Cash was. It's time to give the man a break. I'm just interested in the analytical part of it.