It's not that simple. That command forced me over to the app-store to log into my apple id the last time I ran it for example. You may run it enough or be inside the ecosystem enough that you haven't run into that, but then when my apple-id had errors (I don't buy apps, and only have it because apple forces you to, so I almost never log in with it), I couldn't install xcode... and had to go find a fix on some random forums. Now that I finally fixed all that, the updates are smoother, but it wasn't a pleasent initial experience and did not allow me to stay in the terminal.