Season 4 brings Halt and Catch Fire to a fitting and moving conclusion

Halt and Ctch Fire Season 4 brings this excellent AMC/Netflix series to a fitting and moving conclusion, as the 4 surviving (I will steer clear of all spoilers) go off on their separate paths, following many ups and downs that the experienced in the early years of the PC industry and the birth of the Internet. We see several of the characters change and evolve, in this season and over the course of the seasons, some for better others not. New in this season is a developing plot line around Gordon and Donna's two daughters, now in high school and each striving for her independence - a plot line that to me was not always on point. This season overall was the most personal of the 4, with a lot of emphasis on the marital strains of several of the leads and, in particular, on the tempestuous relationship between Joe and Cameron (Lee Pace and Mackenzie Davis). There's one death that is powerful and surprising, and a few imaginative episodes, such as one that consists almost entirely of a phone conversation between Joe and Cameron and another episode that artfully uses flashbacks to the earliest years of Donna and Gordon's marriage. A few moments, particularly in the finale, are a little too stagey and preachy (Donna's speech to a women-in-business group, Boz's farewell to Cameron), and a few things are a little hard to piece together (just why did Joe and Cameron split?, and who is this Alexa who's suddenly giving Cameron orders?), but these are quibbles, the kinds of things I'd care about or notice only in a series w/ which I'd completely engaged. Fine and surprising conclusion that, in a way, brings us back to the very outset of the series, and M. noticed, and by the way who else noticed the Updike collection on Joe's bookshelf? And do you know why it's there?