That is german tanks in general. The Tiger was the worst tank I have driven when it comes to losing modules or crew members. It would lose tracks if somebody looked at it. And I had a few times one shot took out a crew member + ammo rack, engine, tracks, viewport ect. I had all but 1 module not taken out from a single shot. And one time I had an arty shell go through the top of my tank. And it took me from full health to 78 hp and killed all of my crew. I dont know how a tank moves without a crew lmao. The KT is vastly better but still seem to lose a hell of lot more modules and crew members than say my IS or T20.
All tanks are vulnerable to module damage. Alot depends on the placement of modules and how you place/angle your tank.
For instance my IS-3 gets ammo rack damage about every other game. This is due to the front ammo spots that are vulnerable if you are slightly angled away your opponent and not head on. In contrast I rarely lost crew members in the IS-3. The IS-4 on the other hand, I'm not sure I can make it through a fight without a dead driver, but most modules stay intact, mostly b/c everyone shoots the drivers hatch.
The E-75 I lose the gun and view ports the most. The only time I get ammo damage is if i'm getting shot in the side. Since most people shoot the lower glacias of that tank though, damage to modules/crew is rare.
No matter what tank you are in, arty shots will mess you up if they hit the top of your tank. I've never lost my entire crew, but I have lost 3 at a time to a single arty shot.
Also starting at tier 5 or so, you should have a repair kit, medkit and fire extinguisher/gas on your tanks.