Most people who use Windows could switch to Linux easily (the light users, those that surf social media and stream content)
People who game may have a harder time depending on the games they play (too many anti cheat games refuse to work on Linux)
People who are locked into specific software suites would likely have the hardest time (people who use Windows exclusive software for work, etc)
For me I’m a bit the first group (most of my PC usage) and the third group (Fusion 360 and Adobe Software (though I’m down to only Lightroom at this point)), but I’m also a power user for my systems in general. I’ve currently got 3 systems, 2 Linux machines and a Windows machine. I’m hoping that soon (before end of summer) I’ll be able to get that to 3 Linux machines and a Windows VM (just for Fusion 360 and Lightroom).
Honestly only in the last year have I even been able to do the switch as much as I have as Linux in general has become a lot more newbie friendly. And my main driving factor was Windows 11’s TPM requirement. All my systems technically have one, but it’s disabled on all my systems.
The only issue I’ve had with the flavor of Linux I’m using (Mint) is that changing the lock screen orientation and wallpaper was (IMO) harder than it needed to be. Especially considering that the steps it took to do it were both hard to find and easy to execute.