Just because functionality on the site is done a certain way doesn’t mean that the same functionality is intended to be exposed by the 3rd party API. Similarly, not all Kraken functionality is going to be provided in Helix.
From a security standpoint it’s beneficial for the broadcaster to be the one in control of which 3rd parties have access to that functionality over their channel. So rather than your bot granting your app (or any app, potentially unknown to the broadcaster) permission to do those things for the broadcasters channel, it’ll be that broadcaster granting your app those permissions.