If we open separate castles for different WoE times, those players will have the chance to capture and hold and build up the economy too.??To force the most productive current WoErs into defending more times just because they have high economy is unfair.??It's NOT unfair to expect players in new hypothetical WoE times to build up eco on their own.??
EDIT: As for it being okay to make God Items harder to get...you are aware that when chests were randomized it was like 3+ years before a single god item was made, right? Having realm-specific chests at least gives incentive for meta-strategies involving which castles to target, which is fun. Random chests means a big guild can just turtle indefinitely and slowly get god items - it removes any form of meta-game for castle control and also make god item production an infuriatingly random process.