I agree with you. The only point in favour of using a closure that I want to point out (you already pointed out a big point in favour of objects: the dedicated and streamlined syntax) is that its a more a la carte way of doing objects: you choose how deep you want to go.

Of course in reality its not that bad because you can also use classes as much or little as you want and can use them simply for single dispatch, or namespacing, if you wish.

I do find that in practice syntax and features matter because they push you to think in a certain way and it can be hard to break away from that. For example, I write a lot of Clojure and really like functional languages, but when I use Java, Python or even C++, its all too easy to slip into the OOP mindset even when I set out to just "do functional" in those languages. Maybe that's my failing and its certainly not OOP's fault, but I think in practice (at least from observation) it seems most people are like this.

But yeah, I don't actually disagree with you on what you said.