Cases like 'you're/your' and 'alot' are orthographic errors, not grammatical ones, and are quite different from the Japanese case.
Cases like 'you're/your' and 'alot' are orthographic errors, not grammatical ones, and are quite different from the Japanese case. Of course, with orthography there are also standard and non-standard varieties and both can also change through time, but it's not as systematic as spoken language. Whether writing 'alot' is wrong is more of a matter of definition here, though I'd say that if you're writing something that should follow standard orthographic conventions but you do not follow them, then you're 'wrong'.