All of those email addresses have specific purposes unrelated to customer feedback (job apps, business inquires, website issues), so messages sent there may not reach their intended audience. I can't find any other direct online contact info either though. The official Fire Emblem twitter (which I assume is what people are talking about? or else Nintendo's) also states they don't take questions there, so I'm not sure if Nintendo/Intsys looks at stuff sent there.
If anyone wants to try Nintendo of Japan, they have a page for offering feedback here:
https://support.nintendo.co.jp/app/ask_opinion