No card that I'm aware of grants all the same benefits to an authorized user. Plenty grant a portion of benefits... such as the Amex Platinum card, where additional card members still get some key benefits like as lounge access.

Keep in mind you're likely paying an annual fee for these benefits. If you wanted all your authorized cardholders to have the benefits, the fee would have to rise too. Rather than doing that, the primary cardholder gets all the benefits and additional cardholders might get a subset. Nothing stops your spouse from getting the same card if they want full benefits.