Something I don’t usually talk about is how the rules are different on the Treasure Hunt board. Not so much the ‘stuff upgrades instead of disappearing’ but the simple fact that when you make a match, there will actually still be an object there. It changes EVERYTHING with how cascades work (which admittedly is more important for TH).
Now what some of us might remember is that in Bejeweled (most varieties), when you make a 4- or a 5-match, it does actually do that - it leaves behind a special gem of some variety, of the same color.
Sort of makes one think about what the main game here would be like with some extra oomph in those matches. Not that the basic extra turn and extra mana (and certain trait effects) aren’t enough.