Mac devs have been complaining for a long time that Xcode and the entire developer experience sucks. It sucks (1) in the way that most native development sucks, and (2) an extra layer of suck on top of that.

The Mac platform also used to be very insulated; the culture meant that the prospect of creating an app or simple utility and selling it was viable much longer than it was on Windows, where the culture is that everything is either gratis-style free or warez-style free. The invasion of the Web means that Mac users are increasingly being conditioned to get things for free, too, so the viability of paid apps has taken a big hit. SaaS is the way to make money now.

Maybe they want their programs to be useable by non Mac users too?

SwiftUI keeps breaking stuff constantly.