Late 1945 barely-more-than-prototype tech being used in 1943-44 isn't any more or less alt-hist fantasy than seeing a Black Prince on the frontlines.
Late 45? The war in Europe ended in May. Also CoH2 Multiplayer is more set in late 1944 to early 1945. So Stuff like Ostwind and Tulip Rockets do still somewhat fit
And to me drawing the line at "if it was kinda sort of deployed somewhere at some point maybe then its fine" is artificial, to me using equipment that didn't exist (or practically didn't exist) is exactly that, and arguing whether on not it was "deployed" is splitting hairs.
Ostwind was used. There are records of it.
Sturmtiger was used. There are records of it.
Black Prince was not used.
It is that simple. Don't see how this can be considered "splitting hairs"
And to answer why it was implemented? Well, they want to give UKF a KT-like heavy tank, and Black Prince loooks cool, mean and requires very little explenation, its a big tank with a big gun.
But why does UKF need this? They have Archer and Churchill already and the Axis won't have Tiger II this time (at least I hope they won't) since there were none in Italy.
Why not give Brits the 75mm Churchill instead? As far as I know this unit is not yet present
And if it really bothers you that much, 17 pounders were used in Italy, Churchills were used in italy, just pretend its a field modification or something.
But there were no such fieldmodifications. But ok. When do we get Panther with Nebelwerfer on top of it then? Panther was used in Italy, Nebelwerfer was used in Italy and after all they need something like the Calliope too ...
But COH was always full of bullshit, you may as well call it Company of Bullshit. The sooner you accept that, the sooner you can move on.
This is hitting new levels of Bullshit in Terms of Units. They should evolve but not backwards in terms of historical accuracy ... after all they now have more money on their hands that could be spent on research and stuff