Sure it has a bit of those, but not as much as what I have stated. The main influence and the biggest focus is Northern.
I'm aware of that, but the fact is that there is nothing to stop Skyrim having katanas if Oblivion had them too, since the part of the world where the Akaviri had the most influence on Tamriel was in the north.
I'll have to disagree there, a sword is a sword. If it looks exactly like it does in the real world, it should have the same qualities as the real life version.
Yes, but not under TES physics. there are different materials used, different manufacturing methods. There's a point where artistic license has to trump realism in order to prevent boredom.