I think the Panther II kind of does:

Now, don’t get me wrong, I do fine without, and many more tech trees have needs and priorities that are actually urgent, whereas this is more along the lines of “it would be nice”.
It’s probably accentuated by my personal perception, I really like all Panthers (and do quite well in them) except the F. It might well be my limit, but I don’t really enjoy it, and that’s at 6.0. It’s in my 6.3 lineup but I almost never use it there, and I’d never even remotely consider using it at 6.7 and above.
For the Tiger II 105, yes, as it is, it doesn’t really fill a gap. That’s why I mentioned BR changes along with design changes. There are plenty of Soviet and American heavies at and around 7.0 and 7.3, and it’d be nice to have an equivalent in other tech trees too (more or less what I was saying when talking about the “Korean War” BR: tanks that were built after 1945, but with the lessons of WW2 in mind, and which understandably only a few countries actually were in a position to design and build).
But again, not saying this is a need or anything. Just something I’d like to see!
No argument there. That’s why the top of my list of requirements was “if a real vehicle exists, it always gets precedence”. And Gaijin’s leaving out tons of vehicles from minor trees and even subtrees (cough cough Hungary).
But you’ll still have gaps, it’s almost inevitable. The P43 example I cited doesn’t really have a domestic Italian alternative/equivalent that was actually built. I’d prefer that to transplanted American vehicles.
I think there’s room for that eventually. Once the race for present day is over, and once the missing vehicles from the past are finally added to their tech trees, you could be in a position to look at what’s missing and say, ok, let’s see if the next content drop can be fleshed out with a good speculative design or two.