u kno oasis can't really impose anything right? they just give us ninjas and we figure out what to do with them

the playerbase is a living breathing collective, and by learning/adapting/etc we learn to make metas with the ninjas we're given. that's why we have different-ish metas from CN even though the ninjas are the same (or when we compare them to the points when they were the same)

social science aside, no one's actually stopping u from playing defensive. there are still a bunch of ninjas with healing/defensive buffs (hello chiriku?). the rest of us just prefer fast, aggressive games compared to defensive, passive, 10-round games.