I type fairly fast and do not use a spell checker etc. This sometimes results in my spelling etc not up to scratch. Whilst this does not bother me, and when people criticise spelling they come over all victorious as if they have won some stupid argument, I occassionally use the edit facility you supply.
When you use this, even if only to change one word or letter, it results in the loss of all paragraphs. That is the "new" edit is all squashed up.