.. or at least let me preview all suggestions first.
On one of the Stack Exchange sites I had a perfectly good answer, and somebody edited it so that it contained broken English and wrong answers. I don't care how much reputation the editor has, the OP should have the final say as to whether the edit is appropriate or not.
Or the OP should have the option of 'locking' his answer so that others cannot edit it, perhaps as an overall setting in their profile. I suppose it could be a matter of preference. Some people are much more diligent in their writing than others.