Theme 1 – Strong desire for an open‑source, macOS‑like OS
Many commenters say they would switch to a free, “spiritual successor” of older macOS releases if one existed.
- “I would switch to an open source spiritual successor to even Tiger in a heartbeat if it were available.” – linguae
- “The more technical side of the Mac user base would probably jump ship if a polished, open macOS analogue appeared.” – cosmic_cheese
- “Everyone gets to name their projects for their own reasons. If the pitch is basically an ‘alternate apple’ macOS, I would have chosen one of the other other (alternate) apple varieties as the root of my OS.” – travisgriggs
Theme 2 – Replicating Apple’s frameworks and GUI is the biggest hurdle
Commenters repeatedly point out that cloning Cocoa/AppKit, DriverKit, and the overall user experience is far harder than the kernel work.
- “The only problem is that the ‘it’ that needs to be built is a set of frameworks that’s as robust as Cocoa/AppKit is… That’s really the hardest part.” – cosmic_cheese
- “Developers can port existing Cocoa applications with minimal changes… I wonder how big the actual gap between close to Cocoa App compatibility and full app compatibility is?” – tcdent
- “The userland is gigantic, super complex, and totally closed source. That’s the hard part.” – ripdog
Theme 3 – Apple’s ecosystem is becoming increasingly closed, prompting the need for alternatives
Several users note that Apple’s hardware and software have grown more proprietary over time, making a free alternative attractive.
- “Prior to that, modern Macs were just PCs. Then Apple started to introduce, and then depend upon, their unique hardware. Then the ARM migration using proprietary CPUs and GPUs really kicked it up a level.” – __d
- “The macOS ecosystem is pretty much the same as it has been since 1997… a lot of the kernel extensions are closed source proprietary. The core is still open but a lot of what makes modern Mac, Mac, are those kexts.” – mixdup / reactordev
- “Apple got everything they needed from the OSS community while providing no more than they were required to… Their goal was never to build a community around Darwin.” – mixdup (citing the Darwin marketing ploy).
These three themes capture the prevailing sentiment: a clear appetite for an open‑source macOS alternative, the formidable technical challenge of reproducing Apple’s proprietary frameworks, and the motivation driven by Apple’s tightening hardware/software ecosystem.