Not seeking to change anyone's mind (especially in the Windows 11 thread

) But, the big blocker is the majority of people are conditioned by how things are done the Windows way, a way they've probably been doing for decades, and also probably with a nice GUI.
Simply put, other operating systems don't work like Windows, and quite often for good reason, but it seems jarring and overcomplicated if it is something you are not used to which is understandable.
As ChrisD points out, it makes sense to use Linux as a headless file server as you can build it so that's all it pretty much does, without all the baggage/bloat that comes along with a Windows desktop OS. So there's very little to do with it once setup and also crucially very little to go wrong or if it does go wrong, to fix. The initial investment in setting it up is paid back over years of you not having to do sweet FA, (maybe update it every once and while if it is internet facing of course

).
Once you get into the mindset of how *nix operating systems work, things start to become clearer - and more logical (spoiler - everything user-definable refers back to some sort of config file).
Also Youtube (or videos) are terrible for trying to learn to do anything in Linux, I've been using it for decades, but still refer to lots of sites, ie.
https://pimylifeup.com/raspberry-pi-samba/ for what is being discussed in Ubuntu, it's written for a RaspberryPiOS but it will work for pretty much anything *nixlike (once samba is installed). But there's loads of decent sites like askubuntu/ItsFOSS/pimylifeup/mint forums/Archwiki etc if you google something you want to do. The added benefit for using text as opposed to video, is you can just cut and paste as you read along, basically cribbing someone's hard work
Edit: not always sites, I still have an O'Reilly (now 4th Edition) pocket guide sat on my desk wherever I am

. I miss the cowboys though (iykyk).