You'll want to download the correct dependencies for the bottle after creating it. Off the top of my head.
vcredist 2022
dotnet 4.8
dotnetcore3
d3dx9
d3dx11
d3compiler
You'll want to download Wine-GE, which may or may not be included in bottles. Otherwise, I hear the latest Caffe works pretty well, but I have never personally tried it.
Also, enable DXVK and VKD3D setting the latest ones for that.
Lastly, ensure the renderer is set to Vulkan instead of the default GL.
This is all off the top of my head and I don't remember where these settings are exactly but usually all within the bottle. I don't use flatpak bottles, so I'm not sure what dependencies are already included. Someone feel free to correct me.
I don't remember exactly but yeah you are probably right. I think specific games needed it because they wouldn'tlaunch otherwise. I run a bunch of gog games out of the same bottle just because I don't like having to create a new prefix in heroic. I make back ups before installing every game but its working fine with no issues.
Like I said, I have little experience with flatpak version of bottles so I can only say I'm experienced with the AUR package. If you're having troubles with flatpak, I doubt switching to AUR will change your experience very much.
I think my main problem was not understanding that I need to do something in Flatseal so that bottles sees the mounted iso correctly. On my new set up, I don’t have installed Flatpak yet, so I’ll try the AUR version first 😇 let’s see if it changes something.