They could of added workshops into Eureka that DoH had to go with the help of other players or warping back after clearing to gain access to unique crafts.

As for gathering, it's tricky, they can't do what they did with Diadem and add regular nodes for old unspoiled items since the distance between the areas and the ease of access to Eureka does lead to destroying a market.

As much as I would like to see gathering in Eureka it would be tough unless they had it where you needed to use leves in order to have gather attempts within Eureka.