With quite how many neat toys the Germans had in WWII, I do think it's entirely possible to create two (Or even three) complete German factions that don't share a single thing, though there's no way that's happening in CoH2... and CoH3 (If it ever releases) will almost certainly have overlapping units as well, due to it decreasing development costs, and because some vehicles are just so iconic.
I'd personally /prefer/ no overlap, but I think that at this stage (Primarily because Lelic won't let us edit textures or import models, and because there's already a degree of overlap in the vanilla rosters) It's not something to be hugely concerned about. Arbitrarily limiting what the Balance Team can do in a vain effort to prevent further overlap is kind of going to do more harm than good at this point.
Agreed, my point exactly as well.
I personally would have preferred something like an Italian-German Army with a scenario set somewhere in Africa/Sicily/Italy against the British or Canadians and that would have allowed for far more diversity and new units, as it was discussed for the original CoH before they decided to do Company of Heroes: Online, or at least that's what I read in an interview with the developers at it's 10th year anniversary.
Ok so let's dial back our tone a bit and try again.
You and me both, I am also a fan of the original game. Back then, PE didn't have Tiger or KT either. So when you really want to go with the heavy tanks, either for tactical reason or personal preference, Wehr is the better choice. This sets Wehr apart as a German faction that more specialises in general purpose and heavy tanks, whereas PE has a bigger focus on light and single-purpose vehicles e.g. their short PIVs only deal with infantry, Panthers/Hetzer/Jadgpanther only do well vs tanks.
I don't mind some overlap of roster and as you said, it is unavoidable. But I am arguing from the standpoint that it also shouldn't be too extensive. OKW right now is being perceived (design-wise) as the more "elite" of the two, hence they have the most elite infantry (Obersoldaten) and strongest super heavy (King Tiger). On the other hand, they don't have Brumbar and in many occasions, they may find themselves wanting a Wehr ally who can field that unit.
Of course we can then disagree on how necessary it is to maintain the remaining difference between the OST and OKW rosters.
Well, technically the PE did have a KT in 1 mission at Arnhem in it's Operation Market Garden campaign, and they also have the Jagdpanther which to be honest is probably better than the WH's KT because you have the Bergetiger to revive it with if it dies.
As far as the relationship between OKW and Ost here goes, again I agree with you and like Pip already said had there been more models in vanilla, or Relic just enabled us to edit and importing new ones there would be absolutely no trouble whatsoever.
But again, alas that's not the case and we're far too deep in the "overlap" game at this point so to speak to make a fuss about one faction using 1 or 2 or even more units from the other as part of a doctrine to spice things up, plus as it was already mentioned several times, the units themselves are not just blank copy-pastes but sometimes having entirely different purposes altogether like for example the 221 for OKW being more of a utility vehicle with it's 223 upgrade instead of the 221/222 of the Ostheer.
Another example of course could be the Tigers, Ost's Tiger is a heavy brawler type tank, OKW's Tiger is some sort of brawler/command tank hybrid so they sort of serve different purposes as well.
And in my opinion the same can be done for the King Tigers too.