Turtling's effect on Barricade's up-time remains nearly unchanged, instead only benefiting players in more niche situations. The set effect of Achto equipment and its inferior versions can be used for a net positive increase in Barricade's effective up-time however, as they nullify the additional cooldown times added by the perk.
Turtling is essential for the bomb tank role at Vorago, as the bomb tank must nullify as many magic attacks in the final phase as possible in order for a more efficient kill. The increased cooldown is not a concern, as Barricade is already used for each odd-numbered attack cycle.