Why should the Tempest be removed?
For game balance. Everyone seems to think that if the Tempest were unperked, it would totally dominate the MA. If it's that awesome, it unbalances the game. Perking it just means that the only people who can fly it frequently are the very people who
don't need an edge on the opposition.
If the Tempest doesn't make the cut, then certainly the Fw190D-9 and Bf109K-4 also fail to make the cut. N1K2-J, F4U-1C and F4U-4 as fail as well.
I wouldn't cry to see the C-Hog go, although I do like to fly it. The C-hog with perfectly (or even acceptably) functional cannons simply didn't exist in WW2, though, so the version we have is a fiction.
If I'm not mistaken the others on your list, aside from the N1K2-J, all had 4-digit production during the war and saw frequent combat for the better part of a year at least. I wouldn't mind seeing an N1K1-J to replace the K2, although again for game balance it's nice for the IJNAS to have at least one plane that's competitive in Late War. In any event, none of those planes utterly dominate every fight they're in the way 262s and Tiger IIs do.
You're arguing that only a subset of WWII equipment should be added. Once you do that everybody will disagree with everybody elses, including HTC's, criteria as to why their toy isn't in.
We already have a subset, and yes, this is just my opinion on what it should be, and everyone else is free to have theirs. But I'm basing the above on what I see as optimum game balance, not just on what I think is neat. (Although, I think it's barely short of criminal that we have Tiger IIs but nothing Russian heavier than the T-34/85 - IIRC there were almost 10 IS-2s built for every Konigstiger, although some of that was postwar. But the IS-2 never shows up in American movies and TV and Soviet tanks and planes don't have the cult following that overengineered Teutonic boondoggles do.)