Why is the PickAxe book's new version's size reduced by half?

I am planning to refresh my Ruby knowledge in a month or two, after using other technologies more frequently for a few years. Luckily I won this month’s Pragmatic Bookshelf’s giveaway, and requested the PickAxe book ( Programming Ruby 3.2 (5th Edition) by @pragdave ). I’m planning to read this book cover to cover, and I may also read Learn to Program by @chrispine (I own that too).

  1. I noticed that the new version of the PIckAxe book is half the size of the previous version. Do I need to worry about that. Did they omit something important? Do I read the previous version instead?
  2. Is it a good idea to read both of the books? If yes, in which order? Or reading only one of them is enough?

I’m not a complete beginner, I know Ruby and I have used Rails for years, but after learning Elixir and Go, I kind of abandoned Ruby, and now I want to refresh it and be very good at it.

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