How much more is realistically fixable

[seiseki]

It's not possible for us to say how strong the games foundation is..
Or if the engine is seriously flawed or not..

But they've spent so much time developing the game, so I'm sure they've made sure to do it properly, I think the bugs and performance issues we're seeing is just the final layer, which a few extra months of development would have fixed..

There's no doubt that the devs will continue to patch the game as they've done with the previous IL-2 series.