Keep in mind… I first installed Linux at Mandrake 7.1 (bit of digging will tell you how long ago that was) - it really did take me decades to become comfortable with it… What forced my hand was a few things, dealing with we servers remotely, writing code for them (via windows), and then android was what tipped the balance.
If I’m using a Linux like operating system in my pocket, coding for Linux remotely then what the hell am I dojng still running windows?
You switch because new information has been added… If the host didn’t reveal what was behind one of the doors, you wouldn’t switch (or do, it wouldn’t matter the chances are the same).
Host shows you something that removes things from the table… And that impacts the probabilities.