I really enjoyed reading this article. Makes good points as to why Euron doesn't really fit in this late in the series:
Next to the nuance on display in nearly every non-Euron scene this season, “pure psycho greed” seems insipid and simplistic. There’s more meaning in one Lady Olenna line or Sansa hairstyle than in any of Euron’s supposed depravity. Even Ramsay was a little more layered than that. We’ll always owe Euron for X-ing out the Sand Snakes. But the sooner he sneers at the wrong dragon and gets swept off the board, the better off we’ll be. Game of Thrones outgrew Euron before he arrived.