Sure beats genocide.
Sci, Burham just decided not to follow through with the mission.
Michael would not have been in a position to hand power to L'Rell in the first place if the
Discovery crew had not overcome their cultural and personal differences to bond and trust each other as a crew.
Yes, it's a victory for them, but again the Empire wasn't ever a threat to the Federation or its principles,
1) Yes, it's a victory for the characters.
2) The Terran Empire's spore drive tech was explicitly established to be a threat to the fabric of space-time across both the Mirror and Prime Universes. So, no, the Terran Empire was a threat to the Federation.
3) The Terran Empire's principles are the exact opposite of the Federation's. Thematically, the entire MU arc in S1 is about the lure of fascism and why multicultural democracy is superior to fascism.
nor was there ever a lure for the cast.
There was absolutely a lure for the cast. Michael was faced with the prospect of status, power, and having her ersatz mother figure back.
Given what they almost summoned it doesn't seem like they were wrong at all, but whatever.
The Coppellian Androids almost summoned the Admonition-Makers because they were facing attempted genocide from the Zhat Vash
and persecution from the Federation. And the Zhat Vash were only trying to genocide them because the Zhat Vash were fearful of the Admonition-Makers. It's a vicious chicken-and-egg cycle in which neither side was truly evil and both sides believed sincerely that they were acting to protect themselves and their right to exist from a genocidal threat.
That's what makes PIC S1's assertion of the value of diplomacy so important. PIC S1 isn't saying, "Hey, we can have peace as long as we're all really nice people underneath it all." It's saying, we've all messed up. We've all been wrong, and we've all got good reasons to fear each other, but we can still chose to change and still chose a better path. So I (Picard) am going to be vulnerable to you; I'm going to show you that there is another way, that we can learn to trust each other and earn each other's trust legitimately.
That's what real diplomacy is -- learning to forgive and eventually make friends with your enemies, with people who have genuinely done you wrong. And that's what makes PIC S1's assertion of the moral superiority of diplomacy over war so important.