You calculate damage bonus when doing ratio. That’s how you compare weapons of varying ratios when accounting for damage bonus application/second. The Swiftblade of Zek (11/18) is a much worse flat ratio than a Blam Stick (30/40) at .6111 vs .75. But on low AC stuff it’s not horrible.
11x2+11 (damage bonus)/18 Delay = 1.8333
30x2+11 (damage bonus) /40 (delay) = 1.775
Calculation above is the same for OH but no damage bonus and you should account record swing ratio. For a 60 ranger the offhand swings exactly .75 times compared to the MH parsed over a 20 minute fight.
2h’s damage bonus is not flat calculated as it changes depending on delay; there are still more and less efficient 2h’s.
https://lucy.allakhazam.com/dmgbonus.html
While it does really matter since there are a finite amount of options, the tstaff is an example where a sub 1/1 ratio weapon can exceed a post 1/1 ratio weapon. Not by much, but by some. Especially if factoring the DD proc.
29/30 (tstaff)
29 (weapon dmg)x2 + 29 (dmg bonus) / 30 (delay) = 2.9 ratio
45/44 (priceless brawl stick)
44 (weapon dmg)x2 + 37 (dmg bonus) / 44 (delay) = 2.886