The Fate "lock" makes this new eureka a lot better than Eureka. This way they can truly balance these fights to be challenging and not the snorefest that was Eureka. Also the mettle system fixing the AFK-Train is a huge step forward.

They basically implemented many of the ideas I suggested for the open world Fates, a coincidence like that goes to show, in my opinion how great this new Eureka zone will turn out to be.
Now, just move this exact system to the open world in the 6.0 areas. Fates being used to level is an outdated system, make Fates for other things like super rare achievement mounts, weapons, and glamours.