I've been running Linux on Macs since my 2005 12" PowerBook. There were a couple years in the middle here I switched to OS X with Linux running in a VM due to hardware support issues (the VM was a pain in the ass to use; there were no end to performance problems). I never liked OS X as an OS all that much. It was fine, but I found it got in my way more than it helped me.
In 2016, after getting tired of various hardware bits never working just right on Linux, I gave up and tried someone else's hardware. It was amazing that everything just worked with Linux. I didn't have to fight with bleeding-edge, just-reverse-engineered drivers. I didn't have to wonder if the laptop was going to wake up again after being put to sleep. But I chose somewhat poorly: the hardware I chose was decent, but rough. The battery expanded to the point where it warped the case, which caused the keyboard illumination to intermittently not work, and eventually made the touchpad impossible to use.
So I gave up in 2018 and got a MacBook Pro again, though it was a secondhand 2016 model. Once I installed Linux, I found that the keyboard and touchpad didn't work, and I had to build an out-of-tree driver for it, ditto for the WiFi. After that I found that audio and suspend-to-RAM didn't work. It turns out I was "lucky" that I had an older model; the keyboard and mouse setup in the 2017 and 2018 models hadn't been reverse engineered yet and didn't work at all.
In 2019 I got fed up with having to use the USB-C headphone adapter from my Pixel in order to hear sound, and to remember to shut my laptop down completely if I was going to be away from AC power for more than a few hours. I again left the Apple hardware world. It's not perfect, but again I marvel at how everything just works (with Linux) without tweaking. I hear so many colleagues complain about various inexplicable broken things on macOS all the time, and I think I've gotten the better deal.
Is Linux as polished as macOS? Of course not. I agree with you that the graphics aren't as smooth, font rendering isn't as good (though this is debatable; personally I find Linux rendering to be more crisp and readable than macOS), HiDPI support varies depending on what toolkit any given app was written with. But it works well enough. I think one of the biggest problems that has kept (and will continue to keep) Linux from going mainstream is that even though for the most part it works just fine, when it does break, it breaks spectacularly to the point that you need specialized knowledge to fix it. Fortunately I have that specialized knowledge, so I'm fine, but your average home user does not.
I don't have to deal with Apple's keyboard design issues, random WiFi failures (yes, it is incredibly funny to me to find that Linux WiFi can work better than macOS), Apple's overzealous "system integrity protection", or Apple in general deciding they know better than I do as to how I want to use my computer. It makes me happy, and I feel productive.