Sundered beings have shown they have both ingenuity (in Bad Future Cid's invention of interdimensional time travel) and valor (the PC and Ryne triumphing over the Fatebreaker, a primal incarnation of the latter's worst fears akin to a specially targeted Terminus beast) unsundered beings lacked. It could be argued that every time a sundered being triumphs over their fears they prove themselves capable of something unsundered beings aren't. (Mitron in particular shows great consternation with "imperfect beings" triumphing where unsundered beings failed.)
Whether or not the interdimensional time travel was derived from "artificial" sources is irrelevant - a sundered being accomplished what was deemed impossible.
Yes, thank you, part of Emet-Selch and Elidibus' dying words are acknowledgement they have strayed and their battle was already lost, respectively.
I'm fine with "it's a matter of perspective," but if that's the case there's no point in discussing or arguing about it because people simply won't see eye to eye. Therefore there is no need to knee-jerk respond to people denouncing thevillains'antagonists' actions with a lecture on why their point of view is wrong or incorrect, regardless of their stated reasons; therefore there is no point in posting page-long diatribes in a vain attempt to sway anyone to your point of view (which is why I refrain from doing so).