Yeah, I thought this way for a while, too. I still do sometimes. It takes some time and experimenting to get it set, but once it is, it's pretty nice. I was able to get some presets myself that sounded ok, but I have since started using presets that others have made and I am much happier. All I've done is try to be sure the output level is the same for all of them. Not too hard to do. Maybe one day I'll really dig in and tweak all the things myself, but for now, these presets I've downloaded sound great and do what I need.
The convenience of having everything I need (bass, bass synth, effects, tuner, DI) all on a Nano+ board outweighs the rest.