I like my phone experience to be simple and intuitive. It really lends itself to a walled approach. I'm out doing something else, and the phone is along for the ride.

On desktop, I have a keyboard, a big screen, and more time. I'm sitting down to work on the computer, so having to pay more attention to it is completely fine (for nerds like me). So the walled garden approach feels more restrictive than empowering in this context, at least for me.