I'm unconvincedI think kevtris in the past had said the issue with SA1 and Super FX is that there's not enough memory bandwidth for those chips to run along with the snes core.
All those special chips are implemented on the MiSTer which also uses a Cyclone V (albeit with 3 times the logic space). But I don't believe it would be a space issue in itself at this point. Implementing the special chips so thoroughly when you're supposed to be using carts only leads to aknowledging that it's for roms loading.
I'll play around with the new firmware but my MiSTer has spoiled me tbh