I dont think HotD is a good example. There's more story to that, it's an adaptation, there was always going to be a S3. The writer/creative were told they had 10 episodes, so everything was planned/written with 10 eps in mind. They completed writing all 10 episodes. It wasnt til it was too late(maybe a month or less before shooting the show) that WBD said budget was being cut and they only getting 8 episodes. That's why shyt was rushed leaving shyt unresolved and the big battle not happening, just ppl heading to the big battle.
With this Noah just wrote a shytty ending thinking it was guranteed to get picked up for S2 for some reason. Like someone said earlier, he had too many ideas and didnt know how to execute any of them.