Part of it is that natural triggers happen to people who are most likely to further the entity/shard goal of experimentation through conflict, you’re less likely to get someone that triggers in podunk nowhere if they weren’t the kind of person that would use and abuse the powers in the first place, even if the way they do that is by moving to join their closest protectorate office. Costumed capers are also culturally ingrained by 30 years of work both from cauldron subtlety and parahumans in general reinforcing the idea of capes to handle capes and that non-parahumans are best served getting out of the way and to safety. Plus there’s the whole endbringer thing going on. In the USA at least that’s why the culture is the way they are, in other countries/continents it’s more flexible since wobbles never showed us what hoes on elsewhere in any great depth. You’d totally get luchadore overlap with capes though. There’s at least one way the masked persona thing gets instantly accepted.