I'd love to know why they decided to broach the subject of Tysha in season 1 only to completely shitcan it and never do it again, when Tyrion, in the books, never stops thinking about it.
I think you have to assume that, at some point around season four or five, the showrunners got burnt out and realized they didn’t want to take the series the distance it would need to go to be properly adapted and started cutting corners (or entire characters and subplots) to give them the opportunity to speed things up a bit.
The problem, of course, is that most of those characters and subplots they cut will likely play key roles in what happens toward the end of the series. Like, I highly doubt that fAegon’s plot will amount to absolutely nothing in the books to the point where it could be cut entirely. I expect him to not survive but I am sure he’ll do some important things that have significant repercussions, much like Quentyn’s death is obviously going to spur Dorne to side with Aegon instead of Dany and probably doom them in the process.
Quentyn on the whole wasn’t an amazingly important character, but his death is a stone dropped in a pond. The ripples will carry on after him.
