Fair point:
full service Hyatts I have been in this year with closed lounges
Grand Hyatt Tampa
Grand Hyatt DFW
Hyatt Regency Winfrey, Birmingham
Hyatt Regency Aurora, Denver
Hyatt Regency Ohare
Hyatt Regency Cincinnati
Hyatt Regency, Boston Cambridge
Hyatt Regency, Cleveland Arcade
Hyatt Regency Green Bay
Hyatt Regency Washington Capital Hill
Hyatt Grand Central, NYC
Hyatt Regency Bloomington, MN
Hyatt Herald Square NYC
Hyatt Regency MCO Airport
Hyatt Regency Westlake CA

Hope that provides enough of a sample size. My other stays have been at Hyatt Places/Houses.