That really depends on the kind of writing. For things like journalism and technical writing there are rules that need to be followed and you're not allowed to color outside the lines very much. The really, really good writers learn to be creative within these more restrictive styles of writing. It's no coincidence that many great creative writers had copywriting jobs earlier in their careers.

I can imagine a tool like this making it much easier for journalists to follow a newspaper's style guide or something similar.