I am not standing in front of a target not moving spamming IP and SS, there are tank swaps, during which you should be building giant IP shields, you should be intercepting damage from the other tank to build rage. I dont think sims accurately model prot warrior rage generation in a meaningful way.
what a sim program says and what actually happens in a raid is completely different. you say its not going to matter much, well the logs say different in pretty much every warrior that is stacking haste has more casts of IP than warriors who dont through more SS casts, could be a coincidence but i doubt it.
We do loot council, we run plate light though and if you dont get lucky with titan forge you will be stuck around 865. i got super lucky with 890 boots, 880 chest etc, RNGesus was kind.