TO be clear - the SPG promo is generally better than Marriott one for most people ... and I think meant to shift SPG golds back to staying at starwood rather than clogging up Marriott lounges. Many of these folks stay for one nights and thus the starwood promo w its bonus points by stay is attractive for them.

It also gets people like you, a Marriott loyalist, to try starwood because the Marriott promo is so underwhelming.