hey Retards , design flaws are not modeled in AH for any aircraft or vehicle and many of them had issues, some crippling...get over it.
None as bad as the He177, though late war Japanese fighters had more serious issues due to quality control, not design failure, than the He177A-5 had.
Gameplay currently:
Do you want a heavy bomb load at the expenses of light defenses? Lancaster
Do you want heavy defenses at the expense of a light bomb load? B-17G
Do you want a compromise? B-24J
After adding the He177A-5:
Do you want a heavy bomb load at the expenses of light defenses? He177A-5
Do you want heavy defenses at the expense of a light bomb load? He177A-5
Do you want a compromise? Why take a weaker option.
Now, I'll grant that the B-17G and Lancaster Mk III are almost certainly going to be able to take more punishment than the He177A-5, but the essential issue is that with a free He177A-5 effective choice is removed from the game. Games need decisions and there is no decision when you have a theoretical unperked heavy bomber lineup that looks like B-17F, B-17G, B-24D, B-24J, H8K2, Halifax Mk III, He177A-5, Lancaster Mk III, P.108, and Pe-8 there isn't really much choice if your criteria is just the most effective. The answer, in the mechanically perfect AH, will always be the He177A-5. Sure, the others will see some use for personal reasons, but the most effective ceases to be situational as it is now and becomes a single, universal answer.
Now, that being said, a theoretical unperked heavy bomber lineup that looks like B-17F, B-17G, B-24D, B-24J, H8K2, Halifax Mk III, Lancaster Mk III, P.108, and Pe-8 suddenly has those choices restored, though it has some redundancy in it, but it lacks a German heavy. Nonetheless, should that be acceptable, what then do you think an appropriate perk price for the He177A-5? It would not be as survivable as any of the current perk bombers, but it would have much better hitting power than either the Ar234B or Mosquito Mk XVI. Would an initial perk price of about the same as the Mosquito make sense? Trade survivability for hitting power?
I have often wondered why some people spend energy on arguing against adding something to the game. I don't fly bombers so I don't have any vested interest in the Greif. However I think it would make a cool addition to the plane set.
Sometimes adding something actually takes something away. In the case of the He177A-5 it takes away a meaningful choice, if added per the OPs wish.