Ableton Live, the only one used for live performance by any of my circles (admittedly, in the electronic music scene, not Broadway) is cross-platform.

Logic Pro is, of course, Mac-only as it's made by Apple.

We're not talking about an organization moving to Windows here, we're just talking about a single, appliance-like keyboard-input-to-audio-output computer for someone to play music on in a live Broadway show. TFA writes about buying the machine new for that single purpose. There aren't really "switching costs" in the traditional sense in that circumstance.

TBH I think it's just an ad. The circumstance (we have to buy two brand new computers for every run of a show!) and claimed impact are just too contrived.

EDIT: Further supporting the idea that it's just an ad, every other post from this domain on HN is promoting a product.