Well, congratulations on Marvel creating their own Supercorp. Hope they survive the experience.
While the Kate/Yelena scene did a whole lot of heavy lifting at justifying her late inclusion into the story, I do think her inclusion is throwing the pacing of the show off. As much as I enjoyed it, and somewhat understand why she is included, I think it is a bit of a net negative. I have a hard time seeing how they wrap all this stuff up neatly in the next episode. Considering the only other MCU show I was able to finish was Wandavision, lets just say I am doubtful about the next episode being a fitting conclusion without setting up another half dozen other things, for either a second season or other shows.
I think the most egregious thing is the clear, easy, and quick set up to turn Maya heroic. Something that should have been seeded since she first showed up. But nope, quick few lines to seed, and then "surprise" face turn next episode, so we can watch her show.
Still, a lot will be forgiven if Yelena joins the Barton family for Christmas.