Giving the trio the same bounty and doing absolutely nothing with it, god damn what happened?
The first part was genuinely a brilliant narrative move. Here are three Supernovas who've risen above their stations; here are the powerhouses of tomorrow, equal in potential(*), but not in power.
Then Oda used both Law's and Kid's new bounties as hype steps for the next antagonists of the story - still reasonably done, even though the extent to which Kid was defeated was laughable.
Now comes the hard part. How Oda deals with Luffy and Kid will decide if the bounty idea stuck the landing, or crashed entirely.
Will Luffy be the only one of the three to pull through, showing that, once again, bounties are subjective in-universe, that one is only somewhat defined by that number, and that even when people with the same bounty are put in similar situations, not all of them will behave the same?
Will Luffy also be crushed, showing that no matter how much the Supernovas have improved, the New World is still too tough? (imo, we're a little late for that narrative beat to be re-played)
Will Oda have his cake and eat it too - using the bounties to scale BB and Shanks,
and have Law and Kid return for big roles in Elbaf/post-it? (Law's return is all but confirmed; and Kid, too, is bound to make at least a cameo, if not a full comeback.)
All told, I'm not against the Supernovas Trio's twin bounties post-Wano. Now with Cross Guild's own Marine rewards, it allows Oda a more easy ranking of his chess pieces for the next and final confrontations. I just wish they were used for more than simple power-scaling. Like, try to do something with the economics behind it (along the line of T-Bone's murder for financial reasons). But, alas, the incoming world flood does not leave room for any of that.
(*minus the Main Character Status Privilege)