Bass Thumper,
While BIAB has some great drum grooves, its not a silver bullet for all your drumming needs. Sometimes I would use "in-house" drums, sometimes I would mix BIAB drums with drums from other plugins. Sometimes I would replace them altogether. Maybe one day PGmusic will make their robo "Drummer", but I don't think that should be a priority because...

Out of most instruments, drums are fairly easy to program these days. And they will sound very realistic (because they are sampled) And there are quite a few programs that can handle it very well (including EZdrummer). Two of my favorites are Studio Drummer by NI (included with Komplete) and Steinberg Groove Agent. They are very different plugins (included content, workflow) but that difference is also their strength. It is super easy to add new 3rd party MIDI grooves to Studio Drummer (and grooves are fairly cheap). You can run your project and just audition drum parts on the fly, without stopping, until you find what you are looking for.

For PGmusic drums, I wish they would focus on grooves that are hard to program or very specific genres that just sound better when played live.