[fiddlerwoaroof]

> no operating system has a universal style across all native apps

Imo, an app that isn’t using Cocoa (or carbon for older apps) widgets on macOS isn’t “native”. If you just use the default widget set on macOS, your app will have a consistent style with every other native app. If you use Qt, Swing, Electron, etc., your app will look out of place and break in ways that annoy at least some of your users.

[agos]

there's more than twenty years of examples of macOS apps using Cocoa and Carbon and being inconsistent with the rest of the OS, iTunes being the most egregious