I feel like this is part of the series, Tynion should have been a villain. Seeking to destroy King’s landing and uses his cunning no longer to keep the peace and for his family, but for chaos and the death of his family. He would consult Dany into the path of war that against the whole world and not be so passive.
He became stupid or they made him stupid since the day he flew from Kings Landing. He did not make any good decision since he meet Daenerys or since season 5… what a waste of such great character and for some people the best of the whole ASOIAF (not for me…Tywin and Jon are my favs… Jon, another wasted character sadly).
I have to give it to Benniwize, it takes a special talent to write the characters in dialogues in such a way that I want to kick each of them in the teeth. Every time. The moment they open their fucking mouths. Without a single exception.
One of the biggest flaws not just in Tyrion, but also Varys was not recognising that conquering is an outcome from war. They did everything but the very thing they thought they could. Influence a peaceful conquest.