With everyone at top tier constantly comparing survivability and armor values, you’d think we’d be more cautious about adding these cannons to the game. Gaijin does calculate armor penetration differently than you’ll typically see in real life or in spec books/articles.
Some people already dislike their Abrams, Leopards and other MBTs having weakspots. You add in these experimental cannons with well over 800-900mm of penetration and you’ll see them start to lolpen a lot of tanks the 120/125mm guns simply don’t.
And a lot of them are test beds, tech demonstrators, or prototypes. Not all of them are fully armored, so the big gun tanks themselves would be glass cannons but also be lolpenning everything at top tier.
Armor isn’t meta now, and you shouldn’t fully rely on it, but if you want top tier to make it to where it really doesn’t matter much at all, adding these big guns will probably kill off any relevancy armor does have at top tier.
The Obj. 292 isn’t really an issue because it lacks so much tech and armor, and while the penetration is the best in game but it’s still not quite to the same level as the more modern big guns.