Yoc, Comics Through Time looks like it might be interesting, but when I followed the link I found that it wasn't free--it was offered as an e-book for a mere $375! A bit rich for my pocketbook.
Mopee, it seemed to me that Kavalier and Clay was written by an angry author who wanted to address the injustices of the early days of comics. On the other hand Steranko talked to people who actually lived through those times. I'm sure his fannish enthusiasm for the subject brought out their nostalgic side. Besides, of all the interviews I've read with Golden Age creators, only a few seem to have completely negative memories of their days in the industry. in his Graphic Story Magazine interview Harry Harrison told outrageous stories about being cheated by Victor Fox, but he could still laugh about it.
It makes a difference too that those guys were so young. When my friends and I were trying to break into illustration forty years ago we were stiffed, underpaid, and mistreated by clients. We hated it, and we fought and we griped. But most of the BS just rolled off our backs and became dinner-party stories. It was easier to say "what the heck" when your expenses were low, your ambitions were high, and you had a bunch of friends in the same boat.