Euron stuff is pretty stupid.
They explained Casterly Rock, it was the seat of the Lannisters. Losing it, at least Tyrion thought, would have been a morale crushing move on those still loyal to Cersei. Being unable to hold onto your ancestral seat is looked poorly upon. It was the same when the Starks lost Winterfell. And the Unsullied didn't have anything better to do because they didn't want them part of the siege on King's landing.
We had quite the focus on the last episode about Tarly wavering on his loyalties. He's the military commander of the Highgarden army...He was shown to be with Jaime when they marched towards Highgarden. The same people that would have been expected to protect Highgarden were storming it, that's why it was easy.
Varys not picking up on this makes him quite useless to Daenaerys at this point, but again, we've seen that his "little birds" are now with Qyburn. Sure, you would hope that Varys/Daenaerys had enough resources to know where armies were heading but right now it was a single army that was made up a lot of people from the Reach, so them being in the Reach would not have been much of a surprise.
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