Well, a bit, yes. Sometimes you get thrown off by some mistake that in the best case makes you stutter and distracts you, and in the worst it makes you misunderstand the meaning. As chris-l pointed out, the title itself suffers from this problem, as it sounds like you think *closures* are wrong! I bet that's why you got 4 downvotes here, even though your article has good points. As a non-native English speaker myself - and coming from a Romance language, too - I understand the difficulties of being fluent in English, as that's something that could be achieved with a lot of practice. Just like any other language, after all. You write in English to make your content accessible to an international public, so it's better to get some proofreading help until you're confident to do that on your own.