After a quick test, I have found that it doesn't provide a way to a select date from years ago. How am I supposed to select January 2017? going back 1 month at a time? It's a very common use case.
"Adds additional buttons to jump through years."
Toggles are refusing to make a decision and making your customers do it for you.
Making UI elements like the month picker optional screams of internal schizophrenia in the team. Just turn it on. If you have some loud customer who insists they not be there, make a custom CSS file that hides them.
Don't make your users have to spend scarce social capital to get features that were available in the box. Just turn it on, man.