>but we're not a fan of the ever-closing hardware and ecosystem
What has changed about Apple's ecosystem vis a vis openness, hardware, or the 'ecosystem'?
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.
The Tn chip.
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. The OS relies on the hardware, which is unique to Apple now.