What it comes down to is that you are saying that the Federation would lose the 2372 Klingon war in the prime timeline because a ship which looks similar on the outside and has the same name was involved in the losing end of an entirely different war that started decades earlier for entirely different reasons in a different timeline.
It's ludicrous because what you're basically saying is that the political situation, military situation, including troop and crew postings, technology, and territorial conditions between 2372 and 2373 in the prime timeline are exactly the same as the period of time between 2340s and 2360s in an alternate timeline which, as evidenced on screen, are entirely different.
Even something as small as the fact that Gowron is in charge of the Klingon side of the war in the 2370s is enough to change the entire thing.
If you are referring to me, I never said the YE timeline is the reason I think the Feds could not win a war with the Klingons in the prime timeline in 2372-3. In addition to the post I made directly before yours, I also said this:
Good points being made that Yesterday's Enterprise isn't necessarily the inevitable outcome. As stated, we don't know enough on how the Klingons were able to get the upper hand in the first place, or how their side was doing.
As of Way of the Warrior, it seems to me the Federation overall has superior tech, but Starfleet is geared more towards exploration and peacekeeping, whereas the Klingons train for war. So, I think the Klingons offset the tech advantage out of tenacity, making the odds even. The Federation ships probably have the edge one on one, but the Klingons often have a cavalry of sorts where BOPS travel in wolf packs to make up for that, and the Klingons do have a cloaks on most if not all warships, as well.
The Feds would implement their own cloak eventually, but the Klingons could potentially win key victories before the cloaks were pressed into service by the Fed. Then again, because even though the Feds would be using the cloaks against the Klingons, that would violate the Romulan-UFP treaty, and they may not want to risk angering the Romulans and possibly fight a 2 front war. So, it is possible they may abstain from using cloaks.
I therefore voted stalemate, but lean towards the Klingons slightly, though if they were able to pull out a victory, I would think it would be a Pyrrhic victory.
Don't confuse the conversation I was having with Pavonis, with regards to the E-D of the Y-E timeline being different than the Prime timeline, with why I think the Feds can't defeat the Klingons.