I’m not sure what you mean by “the same treatment as Maus,” many of the technical and logistical problems of the Maus are glossed over by War Thunder making it the best possible version of the vehicle. Doesn’t that mean that Surcouf would be… good?
It’s only real weakness on paper is its long dive time (which you mentioned), but that’s something that most large submarines, especially of the time period, would deal with.
Maus is facing vehicles with ATGMs on regular basis. If they add Sorcouf it wont fight vehicles from its time period.
I think what he means is that it would get power crept to the point of uselessness extremely quickly in the way alot of big flashy weapons are power crept in game, such as the maus by atgms, the the SRAAM missile by flares, or just tank destroyers in general.
And the M41 that was used in the 60’s is set at 6.3. What’s your point?
Thanks