Not to mention the fact that the majority of email clients these days don’t even actually show you the full URL of the mail server that the mail is coming from. It gets obfuscated away over the display name and you have to explicitly go out of your way to actually see the full URL
A young enough kid can handle just about anything put in front of them at the same rate. When you are learning from zero there isn’t a ton of difference.
I mean early 2000s? Oh windows easier 100%. But today? Both are easy im different ways and to a child just starting out on computer it won’t matter