Think about it ! It's the only mode that gives stationary players / campers / guys who like "tactically wait" a harder time shooting at poor basterds who have just downloaded the game, even 80m torso hits feel hard to achieve, because there is no robotic press-shift-to-zoom while weapon sway and recoil are substantially increased compared to "realism" mode !
Attackers/rushers/run and gun headless chickens are at a disadvantage as well ! there's a healthy amount of weapon sway even when you are prone and fully rested(hint: you can still press shift to hold your breath and steady your aim a bit ), run like a dog - try to ADS when you've just depleted your stamina bar and see what happens :D
You can still lvl up your classes/weapons like in realism / action mode but unlocks / character bonuses mean NOTHING while playing classic ! everyone has the same drum mag ppsh, everyone has the same stamina pool, suppresion "resistance" etc
Realism mode also features "peripheral whips", pesky little blobs that warn you when enemy (and only enemy) soldiers are moving outside your FOV, making every kill you make and every death you avoid feel cheap and unrealistic, soooo keep your eyes open for classic servers and give this love mode a fair chance before going back to un-realism or even uninstalling this unique and immersive WW2 fps !!