It's not that there's a hard OSX requirement, but Mainstage (for live mixing) dominates this field. It's incredibly low latency, and there's really nothing as good for this specific use case. Combine Mainstage with on-demand sequencers like Doggiebox, and Apple really owns this market.
Yeah, this is the main reason. We use MainStage for all shows. Also, Mac minis are quickly replaceable. If we’re in a city and a computer breaks, we can grab a new computer from the Apple Store right away.
