Part of the problem is that Amazon has some serious attachment problems to the 8-episode season format. For established IPs with complex and interwoven lore already established (WoT, Tolkien things, Stargate!), it is not a great format. Being limited to 8 episodes per seasons means you have to cut too many details and subplots. For things that are original or have a loose lore (Jack Ryan), the 8-episode format works really well.