Folks who stay in hotels enough to earn loyalty benefits over the course of a year maintain their loyalty because of the benefits they receive. People have different opinions on their favorite benefit, but few would deny they enjoy a beautiful suite if they don’t have to pay for it.
Starwood Preferred Guest has offered suite upgrades to their top elite members for quite some time. Marriott has not. I asked SPG how they feel about their suite upgrade policy now and also asked how Marriott feels about this benefit for the future.