The Echo was added to Eureka in 5.1 IIRC, meaning they did update the zones. There were some other changes as well, though I don't remember them off the top of my head.

However, in the end, does it matter? They are just other things you can spend your time doing. Does it power up your character outside the content? No, but that doesn't matter. Not everything has to do with making you stronger in all content, sometimes, you just need to break off and do something different.