What are the Star Alliance Gold benefits that are also available to the card holder's guest / travelling companion? The obvious one is guest access to the lounge, but what about things like Premium Check-in and Priority Boarding?

In my 13 years being a Gold card holder, almost every airline I fly is happy for my partner to use the Premium Check-in and Priority Boarding when travelling with me. TAP are the only airline that I've come across that says these benefits are only for the card holder, and travelling companions aren't allowed to make use of them.

Are TAP doing things right here? Is it just that other airlines are more generous, and TAP are sticking to the written rules?