Hyatt Diamond very rarely got me upgrades to suites at full-service Hyatts unless it involved having to pay extra in some form. There were some properties that were/are exceptions, but all of those were mainly ones where I had a lot of repeat one-night stays.
My rate of suite upgrade for no additional charge is much better at Starwood and Marriott full-service properties (as and SPG and Marriott elite) than it has been/is at Hyatt as Diamond.
WOH is unlikely to make things any better for me, so Hyatt will see more of my point-burning stays than regular paid stays and Hyatt will get less money out of me than it would with GoldPassport.