There is a difference between not willing to make the effort to write properly, and not being able to. That's for Einstein.
Being "quite sharp" is vague and subjective at best.
I'm referring to jntelligence as in "IQ level" since this is what you can reasonably measure.
I have little doubt there is a strong correlation between one's IQ score and mother tongue written skills - again, given a representative and sizeable sample, counter-examples certainly being possible.
(Obviously, this doesn't imply that good grammar MEANS intelligence).
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