That's odd.
I've never had a heritage room. Do you book heritage to begin with?
I've also had a suite upgrade once at Westin, but I suspect that was service recovery as I lodged a lengthy complaint with the GM on my previous stay. The bottle of champagne on ice was a welcome surprise when I got back to my room after attending a concert
Not an issue for me as I'm based in Sydney now. Of course that also meant I lost SPG Gold this year after having it since ~2007 as my regular stays in Sydney (Westin and Four Points) were what maintained it.
On that note - Four Points always treated me very well as a Gold (either that, or it's because of my regular stays there). I'd always book a city side room, but my reservation would *always* change to harbour side a day or two before my arrival. In recent years I also started getting a harbour suite ~50% of the time.