The Mycroft civilization's placement of one massive Dimensional Hub after another in every corner of the Multiverse while studying each signal of intelligent life over the stars, coupled with Starfall's intensive external diplomacy, had actually allowed them to surpass the Glorious Era.
After all, the Glorious Era had been too conservative, since the support of the Sage, gods, and diverse Legends had made them self-sufficient, exempting the need for external trade or diplomacy. Naturally, they had not intended to simply stay in their own world, but most of them were obsessed in their massive and wondrous buildings, as well as new developing new paths in Extraordinary powers. That had been why they had no need to seek out otherworldly races, and it was the aliens who were keen on linking up with the Glorious Era instead.
