This smacks of the typical Apple, "you're holding it wrong" condescension. I understand why MacOS does things the way it does most of the time. That doesn't mean that I can't still find it frustrating.
As a Windows user, I'd be pretty concerned about the multiplatform story here. They say that this is MacOS only for now but they intend to eventually ship a Windows App, Linux App and web app.
It just sounds like a recipe for a Sketch situation where it's really just a Mac app and web (and other platforms) is a second class citizen.
You and the author are conflating two different kinds of "openness". The user is talking about the openness of the default visibility where you're presumably referring to the openness of the implementation.
That may be true today but it feels like it's changing, though. And I think it kind of aligns with what the authors are talking about. Apps started today are natively collaborative and they're written with web technology.
It's funny to me that there's no acknowledgment that high fidelity web apps and electron apps are taking the wind out of the sails of platform specific desktop app development.
Tweeted at you but copying here for visibility! Am a full stack dev, and enthusiast pianist and have hacked on some music software in the past. Would be interested in contributing!
Mostly comfortable in TS web frameworks, React / Angular / Node