That’s precisely what some youtubers are doing - opting to edit their videos on a Mac because for them, FCP on a Mac offers better performance compared to a better-specced / cheaper Windows computer running adobe premiere.
MKBHD, TLD, Austin Evans, EverythingApplePro, Tailosive Tech, iJustine, PHT, just a few off the top of my head.
Considering that this is their bread and butter, there is little incentive for them to want to opt for the less beneficial workflow (for them) just for the sake of being an apple fanboy.
The more plausible reason is that for them, a Mac does indeed offer advantages over and beyond what a Windows PC offers. Those benefits may not matter to you, and that’s perfectly okay, because your needs and preferences have nothing to do with what they prioritise in a device (and vice versa).
I think it’s about time that you accepted that what constitutes “better” is going to vary from user to user. There are, right this second, millions of people spending money on things that I wouldn’t buy. Things that I could easily find an almost unlimited number of “better things to spend the money on”.
Perhaps I could take the time to tell them all that they should be buying something else that they don’t actually want, but I do. However, I think I’ll stuck to just understanding that they probably have different tastes, personal circumstances, disposable income etc to me and therefore it’s probably best for them to actually just buy the thing that they decided upon with those factors taken into account.