Third, some of the best arguments against a new option have repeatedly been made by Paizo for their new options. That being, when they release a new option, they feel compelled as game designers to support that new option in further material they are publishing. So even if it is optional, that means it because almost not-optional over time because it gets brought up in future publish materials such as adventures and splat books. The initial optional mechanic gets expanded in a future splat book, the optional ability gets put on a challenge to the party in an adventure, etc.. And the argument Paizo makes for doing this is pretty simple - they want to support what they've previously published and feel fans of those things deserve that support. Which means DMs who don't like that option either don't use that published material (which is decrease options for the DM) or has to remove that material from the new published material (which means a lot more work, and more unintended and unforeseen consequences from removing it).