Where do I start with what was wrong with the denouement of the season?
1. The nearly canon-breaking decision to have Klingon ships in the effin Solar System. Martok said in DS9 the Klingons never even tried to attack Earth directly. Of course, this can be retconned that Klingons suppressed the knowledge because it's viewed as a failure, but still, they didn't need to do this.
I doubt the Klingons teach their children about failed wars in their history classes. Especially one that might be seen as dishonorable by later generations. Keeping the Empire strong and united seems to hold more honor than victory in war.
2. The idea that the Federation would willingly attempt genocide, and no one (aside from Very Special Burnham) thought it was a bad idea.
You mean like all those episodes and movie where some Starfleet Admiral told Picard to do something that went against Federation ideals causing him and the crew to reject them and do the right thing and/or make a speech? Oh yeah, that’s different because “reasons?!?” right?
3. The idea that blowing up Qo'noS would stop the Klingon assault - that they would all just reteat back home to airlift the survivors rather than destroy Earth first in fury.
Most species are rather attached to their homeworld. It being threatened in TUC brings them to the bargaining table with the Federation. Losing it would be a huge blow, especially since we were shown how that affected them in the MU.
4. That Burnham convinced Admiral Cornwell of the wrongness of the decision just due to sheer force of will
That and the whole crew standing behind her, refusing to go on with it.
5. That Burnham convinced MU Georgiou to stand down, mainly because she intuited that Georgiou wouldn't kill her. She's from the freaking MU and was willing to kill Burnham only a few episodes ago. It made no sense.
She was shown repeatedly to care for Burnham despite her boasts. She logically knows this Burnham isn’t her daughter, but kept saying how much Burnham would sometimes have some hint of her daughter. If you remember Burnham pointed out that the Terrans acting so savagely was an act to protect themselves. Mirror Georgiou was brutal leader who found genocide perfectly acceptable, but she loved her daughter and a lot of her rage shown was shown to stem from losing her. She’d also be on the run for the rest of her life in an alien universe with no allies or safe haven. She didn’t really have another choice.
6. That the Discovery crew trusted GeorgiouL'Rell with the bomb - someone who in the exact same episode was perfectly fine with the Federation being destroyed.
She wanted the Klingon houses united, she thought the way to achieve that was war with the Federation. She was shown to be wrong, so she went with the other option to unite them after being inspired by Tyler/Voq who got her started on the idea to begin with.
7. That L'Rell basically told the Klingon houses "I have a bomb that will blow up Qo'noS if you don't do what I say" and they all believed her.
Yeah and? Klingons seem pretty bound by honor. Lying about a threat is probably a major no-no to the point where it’s unthinkable. Plus she was holding the detonator, a simple scan would have comfirmed it. Did you need a scene where they sent some guys on a fact finding mission to investigate her claims?
8. That Burnham was considered a hero, when for all we know the withdrawl of Klingon forces was just a temporary reprieve.
Earth was about to get attacked. Worst case scenario they have time to rebuild forces and protect their worlds from future attacks. Plus as we are shown in TOS, TNG, DS9 and the movies, peace between the Federation and Klingons is pretty fragile.
There were aspects of last night's episode I liked, like the Ash/Burnham closure, and the exploration of the "Orion embassy." But man, the war was wrapped up with some lazy garbage writing.
I felt the war could have lasted another season, but it worked. Especially as a wrap to Burnham’s arc of being the only mutineer in Starfleet to a hero who saved Earth and the Federation by taking a stand for what they represent instead of doing the wrong thing to save themselves.