You realize you can just hit return?

I think the (reasonable, imo) design philosophy here is that in dialogs that you rarely use, you make the OK/Accept/Proceed etc. button prominent. But a dialog that users will typically use dozens, many hundreds or thousands of time, having them repeatedly stare at a giant prominent button or "Finish" text isn't actually good UI. Even if it takes you 10secs more to find this on the first try, having the UI focus on the changing elements that the user actually needs to think about interacting with makes sense -- same UI consideration e.g. for chat apps, be it Slack/Discord or AI chat interfaces. All of those have small inconspicuous buttons on the margins of the interface and almost certainly expect users to rely on their keyboard 9/10 times.