Why does the Firbolg’s Speech of Beast and Leaf only aid charisma checks?

@mpetruzz @JeremyECrawfordWhy does the Firbolg’s Speech of Beast and Leaf only aid charisma checks and not wisdom (animal handling)? animal handling relies on non-verbal communication #wotcstaff

— (((Mike Mearls))) (@mikemearls) October 31, 2016