We used to have them separated, but got exactly the same feedback. The problem right now is twofold. Some of the points are 100% interchangable in certain sentences, and we’re simply unable to say one is right while the other is ‘wrong’.
Like many grammar structures in English, sometimes there are just several ways to say things equally correctly. Secondly, some of our hints don’t give enough leading advice. For example ‘Try something more polite’ is a style of hint that we want to eventually stop using, as things aren’t always so black and white when it comes to politeness/many other grammar patterns. Reflecting that, we don’t want users to think it is so black and white either.
One of our intentions in the very near future is to rewrite many hints in a way that reflects both sides of the issue. For example, if you use お〜する instead of いたす, the hint that would be triggered will be something like ‘お〜する is usually used in relation to XYZ. Let’s try something that is usually used when ABC’.
There would be consistency through all of these hints in a way that would actually reinforce things that are important to remember, rather than simply less/more polite.