How much of the novel did the last season of OreGairu skip?

I’ve stumbled across quite a few comments from Light Novel readers who were very upset with the third season of the anime because it apparently skipped a lot of the story, especially important scenes with Yukino which resulted in a very biased view towards Yui.

As someone who’s only watched the anime, it did seem to me that Yukino became a bit bland and out of focus for pretty much the whole season until the later half of episode 11. So, I’d like to ask, are these accusations true? If yes, which important scenes with Yukino did the 3rd season of the anime skip?