Development houses now have an opportunity to bring their software to a larger market share (iPad, iOS and MacOS) whilst maintaining just one code base.
Development houses would also have much stronger piracy prevention (same kind of benefit that enables console games to function).
Development houses would have much stronger control over the running environment (preventing adblock, preventing VPN region bypass etc...).
Development houses would have much more control over updates.
Surprisingly just like the now defunct Mac Servers, Apple doesn't really care about the high end hardware Mac platforms. They only care for those graphic designers/video editor/MS office crowd and their software is coming in iOS forms.