I really could not imagine "not playing" the bass on my tunes? I believe the bass is the easiest stringed instrument there is to learn? You have to think like a bass player though? After that, it's all down hill from there. And you have to think like a bass player if you're doing it on a keyboard, or a VST app as well? So why not play the bass?
Play the bass people? I know there are bass players out there? Like me? Play the damn bass...
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But then again, I do vsti based instruments for orchestra, and sax, etc... So I guess, it just depends on which side of the coin you're looking from? However, and again? The bass guitar is one of the easiest instruments to play "reasonably well?" So I strongly recommend that you get one, "and play it." This instrument anchors everything else? It locks the groove in w/the drums? IMO, it is the single most important aspect... But then again, I'm a bass player? So take that with a grain or two of salt...