Quote Originally Posted by Nalien View Post
Well... They knew they were doing Eureka long before 4.0 was release... That they don't even know what they're doing with Shadowbringers Relic yet...
I believe that "don't know yet" was said back during the lead up to ShB's release. It was likely that they were still discussing whether they were going to tie the 5.X Relics to the next Daidem/Eureka type zone or a Zodiac/Anima questline. If they decided to go with an independent questline then the new exploration zone will likely require its own unique weapons.