Actually your questions had already a very solid response to our avail: The one which will probably rank first as most underrated submarine simulation in history ... Silent Hunter 4
It is the perfect balance between the SH5 eyecandy and the SH3 gameplay, and has potential to surpass them both in their respective strong areas if developed hard enough. But there it is, collecting dust in many people's shelf, and far away from the attention of most of the talented modders. If it had received half the dedication and talent that SH5 already has, we would no doubt have the best ever submarine simulations. Sadly it didn't

, and probably the end of the GWX4 project meant the definitive burying of the promise SH4 had. With a GWX4 we would have seen many other mods flourish around that solid base, and many more people attracted into the game.
The irony is that SH5 not just killed itself, it also killed UBI's submarine gaming franchise and even also killed the amazing potential of his predecessor and our main hope of getting a fantastic and solid submarine simulator. That's for me reason enough to hate SH5 and lack any interest on it