Talking about exploratory content as "just Eureka/Bozja" sounds a little disingenuous when considering just how big that kind of content really was. There's really no single instance of content to replace it when so much goes into it. (DRS is still the most fun I've had in this game and it was just one instance inside Bozja).
Restoration was actually something to work towards with every patch too, with no real replacement to it besides IS, which was supposed to be the replacement to exploratory content already.