It's just a month in, but I'm quite happy. Everything works and everything is pretty. I can concentrate on important things, and of course on social media shilling.
Sure, macOS has its flaws. Sure, GNU command line tools are better than the BSD ones (fight me). Sure, it's not as hackable as a Linux machine.
But I've never been as productive. Everything works, I'm not fighting any hardware issue — Bluetooth? Wifi? Resume from sleep? Hell, I'm even rocking an external GTX 1080 GPU via Thunderbolt 2->3 adapter, and playing 4K games in Bootcamp.
I have a 16GB rMBP 2015, which probably is the last well made MBP, since the newer revisions seem to have so many issues, but I don't see myself going back to a Linux desktop ever again.
To be honest, the only two things I miss that work really well on Linux are Docker, and Wifi packet injection (aircrack-ng & co.)
There are plenty of gotchas, so make sure you read up on egpu.io and /r/eGPU
But once setup, and when Windows doesn't break everything with an update (happened with the Fall Creators update), works great and performance should be within 90-95% of a desktop setup, provided you're using an external monitor. You can use the internal LCD, but TB2 bandwidth will be the bottleneck in that case, and you'll get a bigger performance hit.
Here's my success post on reddit: https://www.reddit.com/r/eGPU/comments/77e86g/success_macboo...
It makes sense, since Docker relies on the Linux kernel and its VFS interface, which have to be emulated on other OSes.
Meanwhile on Linux, I had to wait for a month or so before the Docker PPA was updated after I'd upgraded to Ubuntu 17.10. (I've since migrated to an LTS-based distro, lesson learned.) I also like to use Kitematic for reading logs, which was annoying to install, and which looks out of place on Linux because it's an Electron app skinned to look like a macOS app.
TimeMachine and comprehensive HiDPI support are great bonuses. If I need to work in some other environment, I have VM's, Docker, and external development environments. The primary concern with macOS is security: both inherent (telemetry, etc) and what's been in the news lately, but with some easy tweaks and good security practices otherwise, it's generally not something I worry about.