Again you’re moving the goalposts demanding greater and greater explicits not because you’d be convinced but because you’d expect the explicit doesn’t explicitly exists. This is a low stakes conversation about a fictional universe intuition reinforced by references is sufficient, and if in subsequent series writers forget these details or go another way well then that’s just how the cookie crumbles.
Though I don’t know why you don’t find this very intuitive the episode Regeneration featured borg drones from the events of First Contact, sure you may be entitled to your wishful thinking but to claim its never alluded to or incredibly hard to believe that first contact one of the more successful startrek films was an influence on enterprise is itself incredibly hard to believe.
As for Dauntless I’d say the screen canon speaks for itself why would I need characters to constantly break “show don’t tell” and hold my hand every step of the way?