So first this comment is clearly influenced by your own preferences for MacOS. Stackoverflow Developer Survey shows irl about 40% of development is done on Windows, 30% Mac and 30% Linux. So the platforms are at least equally appealing in real world circumstances.
Secondly Goobuntu was insanely well integrated with Google’s custom source control and internal ecosystem. No one actually did real engineering work on Macs because it was disallowed for security reasons by policy, but I also never met anyone who wanted to. The tooling and customization on Goobuntu was very good and although I’m sure people asked for a better experience on Mac, the ability to customize and control the Linux dev experience just beat Googles ability to modify MacOS hands down.
Also I think there’s very little MacOS offers from a developer perspective that isn’t matched or easily trumped by Linux, but now that’s my personal bias showing ;)