This thread is sad. skorpion, have you ever used HE in WoT?? if so, you would realize that HE damages just about everything it hits. that's how arty works. that how the 105mm works. when I had my Sherman in beta I stuck the 105 on it and owned just about everything I came across. apparently you are too thick-headed to realize you are wrong, and you will probably try to insult me with your next incorrect post. I dont have a sherman in my garage atm because I havnt played my acct much but if I get one I will gladly do a training battle with you and wreck your precious tiger.
You need to be careful when you say 'HE damages about everything it hits' . While technically true there's a big difference between the HE Artillery rounds, the HE from howitzer guns and the HE from regular tank guns.
The HE from artillery has insanely high damage range and good penetration for an HE round. Plus the artillery tends to drop those rounds on the soft upper armor thats why they hurt so much.
HE from howitzers have just a tad better penetration values than the regular gun but their HE damage is double, sometimes triple that of regular guns.
HE from regular guns has very poor penetration and usually just about 150% the damage an AP round would do.
HE damage regardless of gun is severely reduced based on the armor surface it hits. Hitting a heavy tank with an M10's 76mm HE in the front for example will do a very small amount of damage (1% hp or less per shot)..but its better than bouncing off an AP round.
Thing with HE is that it can damage modules but you need to remember modules have HP themselves so if you hit an IS4 with an M10's 76mm HE in the front the driver will barely take damage because the armor absorbed almost all the damage. A howitzer on the other hand would do mediocre damage to the tanks HP and ok damage to the modules in the same scenario because its HE damage amount is much higher so more of it will seep through the armor.
Personally, the only time you should use HE in a regular gun is if your AP wont pierce the side armor. Only then would an HE round be of use as you can start pelting the engine, tracks and hope for an ammo strike or engine fire.