For one, top boxers are slightly more active.

Champions still fight in non-title fights, where they stay sharp and can be seen by the public more often.

There are more rematches. And even fighters who weren't competitive in the first fight can get a 2nd chance. For example, making Martinez-Williams III would be easier to sell in Asia for some reason. See Naito-Pongsaklek, for example.

And most importantly, fighters retire at the hint they might be losing a step, not after it's proven they don't have it by geting beaten 5 times. You don't see that many older fighters in Asia. It's more of an anomaly. You especially don't see former world-ranked fighters or ex-champs being allowed to fall to journeyman status. If you make it near the top and stumble a time or two, the game is basically over. You rarely see a final act play out to the extent you see over here.

There are exceptions. And the tolerance for horrific mismatches is perhaps higher in Asia, but there's some things I like about how they operate.