Should the cmdlets for FlashArray authentication have the -Credentials parameter? Or global $Creds variable?

[mikenelson-io]

This one is up for discussion. I removed the -Credentials parameter from the cmdlets that execute a login to the FA (except for the one cmdlet that needs two sets of credentials). Instead, I added a global $Creds variable that can be defined for use with all the cmdlets in a single PoSH session.
Should those cmdlets have that param? Or is a global a better option? Or is both the answer?