Ten years ago I did a OMB gig using:

Roland R-5 drum machine
Ensoniq Mirage rack sampler (for bass/guitar)
Roland MC-500 sequencer
Kawai K-1 tone module
Korg CX-3 keyboard (organ)
Kurzweil K-1000 (mostly for piano)
Peavey mixer
Peavey CS-800 power amp
Bose 801 (pair)

and today I use:

Yamaha 9000 Pro
Motion Sound KP-200s

I can do everything with one keyboard today that I could with that ensemble of equipment back then and more, and I think it sounds better now too. And if you go back to my OMB rig from twenty years ago, the difference is even greater.