>>50310405They remove choice and variety but also increase choice and variety.
>Urshifu-S is the dominant physical attacker in OU>It is so dominant that everyone has to pack a physically defensive counter. Moltres, Zapdos, Buzzwole, physdef Clef, Toxapex, and Hippowdon are on every team>Teams that don't run any of these Pokemon are 1 bad prediction away from losing to Urshifu, so everyone above 1300 ELO is using one or multiple of them>Weaker physical sweepers get pushed down because all of these physical tanks have flooded the tier, and they can't compete with Urshifu-SSUDDENLY URSHIFU-S IS BANNED
>Now there is no need for dedicated Urshifu counters, so Moltres, Buzzwole, Zapdos, and Hippowdon fall out of favor, with all but Zapdos falling out of OU>The niche of strong physical sweeper is left open, since the dominant threat that outclasses all others is gone. Several physical sweepers rise to prominence, like Weavile, Kartana, Urshifu-R, and Zeraora>Team variety and choice has improved, since you now have more choices than "Do you want to run an Urshifu-S counter or do you want to lose whenever you see an Urshifu-S?" 