Comment by suddenlybananas

My point is that is not at all a counter example. It is left-edge deletion which is a distinct phenomenon which has been studied since the 70s. It might look like pro-drop to a naive person but it is fundamentally different. For example, you can delete plenty of things on the left edge that _aren't_ pronouns and you can't delete pronouns if they're not on the left-most edge. These are things that don't occur in pro-drop languages where you can always exclude the pronoun.

do you want a cracker -> you want a cracker?

I think he is dumb -> * I think is dumb

It's a lazy dismissal from someone who doesn't know the relevant facts.