Display More4000 raw physical damage is in reality more, because all modifiers like pdmg-food will boost the 4000.
That means, you should look into your actual physical damage when you are buffed and use the gloves. The damage will increase more than by 4000 which will result in reality an aggro boost by anything around his 36%
(the 36% is not accurate, because it depends on multiple factors like which buffs you have, which tier is your weapon and so on)
But in reality from the highend perspective the gloves are not needed, because you literally have aggro without it and so it's kind of a waste "click" or "useful" buff. But I guess if your gear/aggro isn't that high, it could help
I think the gloves could provide a more useful buff.