I just went onto my Alt to look into this, but seems that the Team Level restricitons on the Districts were lowered to be (Team Level required = District Number). The game used to have a Minimum Team Level required to actually get into that District, but seems the Devs have removed it. So that probably means the Devs wanted to make it easier for players to progress in the campaign. I don’t think having a MAX team level restriciton on Districts is a good idea, because you still need to go back to earlier districts to farm gear for your new characters as well as certain gear recipes for high grade characters… I’m Max level and probably the strongest player in the game, and I regularily go back to earlier campaign missions to farm my gear with Quick Wins. So what is it that you’re trying to accomplish by putting the restrictions onto the District? (not criticizing, just wanting to know, as there may be a benefit that I’m not seeing myself)
As for the Hero Level being capped by Team Level… that currently is the case in the game… your heroes can only be leveled up to be equal to your Team Level.