Gloves haven't been OP for a long time, in NH patch 7.1-7.2 (so old and new traits) they simmed roughly equal with Legendaries like the Boots/Legs on single target, and on a good RNG run you'd do better without them since they were poorly itemised for Arms and rage wasn't really an issue, put adds into the fight and they were an unstant unequip, replaced by legs/trinket.
Though they did sim the highest (paired with execute ring) on single target for me personally prior to this patch, it was only by a very small margin. In this patch though for some reason they are simming incredibly high, 50k ahead in the sims I did prior to the recent nerf, not looked into it since.
- - - Updated - - -
Testing some builds on dummies and had some interesting and unexpected results from weird builds.
No buffs, no execute phase (only executes were from the ring proc). 416mil damage dealt and at the point I stopped fighting I was at 915k dps. Easily sustaining over 900k. Overpower, Rend, Titanic Might, In for the Kill, Ravager. Overpower seems pointless since it's barely ahead of Dauntless above 20% and simply becomes a loss for the execute phase, but I had it talented on this run. Rage above 20% is so high that for that phase of the fight Dauntless doesn't contribute anything, you generally can't spend the rage pre execute phase.
Current pre-nerf Trauma + OPS setup turns Arms into a complete unstoppable wrecking machine in the execute phase, I'm guessing that is where it's gaining its simmed dps advantage over other builds. This build seems extremely capable though, and is a lot more busy (+ GCD capped).
https://i.gyazo.com/2166d20b2e72bc36...e6c7aac725.png - Another run with better RNG, same build was 950k when I stopped.
Really impressed with it, it gets trashed by Trauma/OPS in execute phase though, but outside of that I'm doing higher numbers with this.