With less discard overall, they're able to pull off their gameplans more reliably and manage to survive long enough to do so
That last bit is the most important part
I learned how to read rosettes, the best way to do water tests without damaging real cards, light and blacklight testing, even rip and bend tests, until I felt fairly certain I could spot a fake were one presented to me
However, as the Supreme King performs these actions, Jaden himself is left in doubt about what he needs in order to be complete not only as a Duelist, but as a person
The fact you can reuse Powerstone tokens instead of sacrificing them is also a big upside of Treasures, as you can quickly build up a huge cache without needing to be stingy with how you use them