If command was just the control key moved over I wouldn’t have a problem with it, the issue is that the control key still exists and is used in a lot of applications, often inconsistently. It’s a constant frustration to me when I hit the wrong one either due to muscle memory or simply because I forgot how each specific application is set up.

The argument for separation the command and control keys isn’t entirely wrong as using the control key for gui shortcuts was always a bit of a hack, but OSX doesn’t actually have any way to enforce the separation there, so it just makes the user experience worse in 3rd party applications which weren’t written primarily for OSX, which is unfortunately the case for most applications I use.