Linux

Ever read some of the microsoft forums? Just as many people seeking help there - the only difference is we don't have an over eager paid employee replying with scripted answers which don't help.

Linux is as simple or as complicated as you want it to be. Most of the mainstream distros "just work" on most hardware. I've installed Mint, Rocky, Ubuntu and Debian on laptops and desktops for relatives, including those who aren't remotely technically gifted. It was as easy/easier as Windows to install, set up and get running. The users are happy - they can use cheaper hardware (and don't need to upgrade a perfectly good laptop for Windows 11) and are entirely free of software costs and subscriptions. Everything works and things don't break - just like Windows and Macs. Most people just want their computer to turn on and let them run stuff. All three do that equally as well.

I've also installed linux on hardware clusters costing hundreds of thousands of pounds and that definitely wasn't a simple or quick process, but that's the nature of the task. Actually, installing the base os was probably the easiest part. Windows just isn't an option for that.

You ask a fair question - you're not unique in your viewpoint and that's probably hampered takeup more than anything else. What makes you a bit better than most is that you actually ask the question and appear to be open to the answers.