Marriott is not to blame, the OP and the poster you linked to are to blame for not reading the rules. Suite upgrades were never a definite perk and they are still not, even in Asia with the new language -- it is, as it always has been, at the discretion of the property.

What's more, to expect a suite upgrade at a resort property is to me a fool's errand, for Marriott explicitly states that breakfasts are not required to be given to elite status holders at such properties, so it seems a wild stretch to me that anyone could possibly think that suite upgrades at resorts are likely, much less a given at such properties!

It also seems to me that the average joe who posts on the Insiders forum seems to be quite ill informed as opposed to many who post here!