Its almost always tools and programs used in their professional life. The 365 suite, adobe suite, fusion 360, simulation programs, …
Yes i know there are free or alternative options, but they are never as good or powerful as the full on suites that have existed since the dawn of time.
Ive been running linux ( dual boot with windows ) on my work laptop for 9 months at this point and i love it. But sometimes, i do have to boot windows for one of the professional suite programs.
Depends, im a power user that does all kind of things on my pc. Gaming but also other workloads, so ill be dual booting with linux as my main soon anyway.
But for pure gaming, ye linux might do depending on the games