Oh, I'm certain it's necessary backstory. They mentioned The Blessing in the last episode, too. I think the Ghostbuster said it over dinner. But it was so sluggishly established!
I can't think of a single scene that didn't go on for at least a good minute longer than it had to. A couple of the cutaways, say. There's nothing long with long scenes, but Quarantino this wasn't. They weren't gripping long scenes. It was like watching life unfold at its own pace - which, I guess, is what I'm not keen on. A story with this little to say could've been told within fifteen minutes. Or, if you want to keep all the character development (and I wouldn't blame you if you did!), woven throughout the series. If ep six was boring, how much better would it have been had another mystery been coming to a climax? Lots of disparate glimpses of 1927 and 1928 New York, stripped throughout the series.
I don't have any problem with the story itself, or the characters, or the concepts behind them - perfectly interesting, all of them - but it was told in a way that I found frustrating beyond belief.
I will rewatch it, though. Not immediately, but at some point this week. And I am genuinely, sincerely, very glad you both enjoyed it. Feels good to be in a minority on this one!