@nick#Sonos has replaced its app not because they truly think the app is better. But because they can replace specialised Android, iOS, Windows, and macOS teams with one generic team who know how to use cross-platform tools.
It goes beyond that, though. Look at the ideas behind the new home screen, which essentially can be described as: "put what you want on it". Is that primarily a user-facing improvement? No.
Rather, it's a reason to not rely on designers who can carefully think through information architecture, viewport sizes, user flows, and the best ways to present information. Make it the user's problem so that they can fire the people whose responsibility it used to be, or move them to another team where they won't be able to do their best work and will eventually quit and not be replaced.
This update goes way beyond #accessibility. It's a fundamental shift in how they do business, and it will be shit for everyone. That, more than the lack of #VoiceOver support, is what will probably cause me to move away from their ecosystem.