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This foolish idea produced a whole generation of students who could write creatively, but were unable to express their ideas with sufficient clarity for their readers to be certain of their intended meaning.
Quite so, and it is this inability to express themselves clearly and concisely that is the crux of the matter. It is all very well to blithely state that it doesn't matter if one uses ‘there’ instead of ‘their’, but in certain instances it really would matter, as a particular sentence could be read both ways, have them both make sense and yet the reader may well obtain the exact opposite of the intended meaning.