For me, the biggest reason not to use linux are windows-only apps like CAD software. That software was a must have on my university, and now Im stuck with it lol. I switched to linux anyway, but still struggling to find best workflow between dual boot and windows in VM.
But linux today is so available and friendly. I have POP! OS on my desktop and partner can use it with no problem (windows user). Its so freaking intuitive, much easier to install and use compared to windows IMO. I believe people are not afraid as much as they dont care and microsoft is pushing their OS much more than any other alternative