Privacy concerns for the most part. Also for better desktop performance and less bloat on my existing hardware. I was not going to buy a whole new laptop just for macOS, and also gaming on macOS is not nearly as viable.
I would like to somewhat dispute this idea that all Linux users enjoy fixing problems for entertainment. Don’t get me wrong, I can and do solve problems in Linux, but once I have a setup that works, I just use my machine normally rather than constantly tinkering with it.
As for how I went about the switch, fortunately, my laptop at the time had 2 NVMe slots, so I installed a second drive and dual-booted between Windows and Linux for a while until I had set up replacements for all the programs that I use regularly.


Side question: his job is asking him to run work programs on his personal machine? If they are not willing to provide a work laptop or if it is something that does not require powerful hardware to run, I feel like in that situation I would buy a burner laptop off ebay to run the work thing on.
That’s just my personal preference, but I do not mix work and personal things on the same computer.