With regard to modules, I've been through a few over the years. I've just replaced the Ketron SD2 with a Roland Sonic Cell. The Ketron was a good module and I like the Sonic Cell even better. Unfortunately, it has been discontinued but you can still find them used. I use an EWI with it and use all custom patches for that channel but use the factory patches for BIAB.
I like having the real tracks in addition to midi. As many have mentioned, there's a place for both. But I still use midi quite a bit. The modules have definitely improved since I started using version 6 of BIAB.

Jeff H.