That’s not a Rogue specific nerf. I think between Cheap/kidney/Blind and sap, they’ll still be alright with regards to your idea of baseline Relentless going live.
Warriors, DK’s, Ret’s, (maybe Feral and Hunter) took a bigger hit from this. The pacing of Shadowlands allowed for my only kills to be inside of a stun/strang during my go - that was just reduced. Other classes are similar. The only time a rogue would die if you chose for whatever reason to go one, was in a stun.
I’m not against the Relentless change going live. It’s not a good feeling being unable to play your character for a period, but I’m confident Rogues received the better end of the deal here.
If this means you can’t get sapped out of Kidneys I’m thrilled.