You are right, you don't need it. The pink card has never been anymore than a 'nice to have '.
But, these threads always turn into a p!ssing contest; those who love the card will try to convince others that you are more 'integrated' and accepted if you have one.
Those of us who don't have the pink card (and do not desire one) will continue to yawn and use our Thai driving licences to check in at hotels and get the Thai price at Nong Nooch Gardens, Supatra Land etc, etc.