[mahathu]

Not in agglutinative languages where verb endings considerably change the meaning of a sentence.

[vidarh]

Even then you'll find a conversational environment far more forgiving, because of a combination of context and a feedback loop. There's a reason childhood acquisition of language works just fine without an explicit practice of grammar rules.

The point isn't that you wouldn't benefit from it doing better, but that it doesn't need to be anywhere near perfect to help a typical language student improve.