Feedback: 99 totems should reward the mount right away, not half a year later.

[Nezerius]

Why did they got back to 1 totem per kill?

No one really knows why the launch trials are excluded from the decision they made back in ShB, which was having EX trials drop 2 totems (starting with Diamond Weapon). You'll likely see 2 totems from the post-launch EX trials, similar to how EW was handled.

Afaik, the only time SE has used fight length as a reason for 2 totem drops was for Hades EX.