MARSHA should have it and clearly Salesforce is meant to have all kinds of detail, but in my experience at least most former SPG hotels (the only places I’ve stayed at before) no longer have any information about their customers.
It’s not just that the SPG stay detail was never migrated (unsurprisingly), but in most luxury hotels where I’ve stayed multiple times since the system change-over the reception never knows whether I’ve stayed there before (Unless I know the staff personally, like at the Sheraton Grand Park Lane).
Of course it’s not the biggest deal, but personalisation and not having to repeat oneself each stay is part of what I expect when paying for a luxury hotel.