All of the above is why I really dont like casemated SP-guns
for a few points less for the turret
a) They don't react as well to flank attacks - less chance to turn to face firers
b) When stuck due to track or engine hit, then they are only effective where the guns currently pointing
The German case where Stugs have a decent
8 armour at the front, whereas the versions of the Pz4 that have the long 75s don't carry more than 5 armour (the turret could not handle any more weight - it was at maximum) is about the only reason to stick with them until panthers arrive. (If up on a hill or dug in and so hull down, more hits will register on the turret, which in the Pz4s case is somewhat less optimal situation than desired!

).
I do stick with Soviet Su's - the later one has more ammo than the IS2 (but a stuck IS-2 may be able to sweep a useful zone), and the 152 one with all HE ammo is nice, as I really like great big bangs. Lobbing 6 inch bricks into infantry formations, trucks, tanks carrying riders - what's not to like

! - so I usually take some 15cm sturmpanzers if German, as well. The Su-76 are cheap direct support for a soviet rifle company, better than a little light T-70 tankette anyway.