Current State of End-Game Contents - A Blog Post from A Japanese Player

[Kuwagami]

In fact, I think it was one of the reason why BG and many other groups that cleared T9 before Patch 2.3 actually managed to clear SCoB faster than BCoB - because SCoB deploys repeated/similar tactics from EX Primals and BCoB.

I think it's mostly because T5 was off for a very long time with no chance to even try it

That and the military-level coordination of BG