Certainly, it's much better to communicate with perfect pronunciation as well as with perfect grammar, but that's not usually the case.
Pressing people to drill grammar some teachers make them believe that without perfect grammar they can't speak English.

Spoken English grammar is pretty easy - one can learn it just during a few lessons, and, which is of more significance, he can also widen it to natural grammar in due time.

Speaking is just the thing people are seeking nowadays. And, I might say, there's nothing frightening or appalling in speaking, especially in public (moreover, speaking privately may cause you some disturbance)