With 6.1 only, Samurai went from the most popular melee with reaper during the previous savage raid to one of least played melee in Ultimate. Only reaper has fewer numbers but that's because it's quite weak in terms of burst for that content.
Samurai used to be great at 1 min bursts, now it's completely gutted.

There are now even more monks who cleared this ultimate than samurais, it's very telling the job lost all love from high end players.

Terrible gameplay + gutted numbers = dead job. It's not even good at what it was doing before, and it's a mere shadow of its past self.

Also guaranteed crits is equivalent to zero crit. It's the same result since it's basically a fixed potency. It's awful game design.