I don't think the reason is any need for research. There have been quite a few occasions when I've made suggestions regarding how to fix obvious, major flaws. I

I don't think the reason is any need for research. There have been quite a few occasions when I've made suggestions regarding how to fix obvious, major flaws. I've stopped bothering, because the response in all cases has been - not "sorry, we don't have time to implement the fix," which would be entirely forgivable, but some polite variant of "no, this is our product not yours, so we'll do things the way we want, not the way you want, so get lost." On the bright side, that means if you are willing to set ego aside, you gain an immediate and substantial advantage over the competition.