2) You always forget that a AA can put his bow down after his burst DPS, only to get a minimal penalty to melee DPS in TWF, since most TWF feats are free on a ranger either way.
3) Fury manyshot, in 20 seconds, assume a low DPS ranger that would only hit 900 a shot as AA we have 75 base, some simple calculations:
Unbridled fury: Every 3 seconds, Adrenaline every 5 seconds. Manyshot duration: 20 seconds.
So to add the 20 seconds
Even assuming only one shot a second we get this (you get more shots)
3600 on unbridled, this is at seconds: 1,4,7,10,13,16,19 = 7 times = + 25200
3600 on regular adrenaline: this is at second 2,8,14 (assuming at 20 we're not in time) = 3*3600 = +10800
300 on regular hits: this is at 3,5,6,9,11,12,15,17,18,20 = 300*10 = +3000
4 arrows a shot: that means 40 adrenalined arrows of which at average 2 miss: -1800
That also means 40 not-adrenalined arrows of which, again, 2 miss: -150
BUT, 80 arrows in total, of which at average 4 vorpal: +2000
17-20 crit multiplier: From the 40 without adrenaline 8 will crit, assume only *3 multiplier: That will add 8*150 damage which is: 1200 damage
This is a rlly low DPS ranger, a good unbridled manyshot will hit at average (you boost yourself before doing that and then 75 an arrow is rather low IMO): 25200 + 10800 + 3000 - 1950 + 2000 + 1200 = 40250 damage done in 20 seconds is an average of like 2000 damage per second in this burst. I really rounded down ranged sped as u shoot more by far, but even then the boost of tempest, which is by far too feat-intensive IMO doesn't do the trick, I did not even include additional effects on the weapons and I rounded this down. I hope this helps you understand how in a boss battle where the boss has 150k HP in this case with fortification (raid boss so gets lowered + precision which is musthave on AA), I'll even lower the DPS with 10k (which is ofc not true but I prefer to beat you with numbers that low you can't contradict em): 30k damage in 20 seconds, this means that he'll have 120k HP left by that one player alone. Sorry, but the tempest get's nowhere near winning that DPS boss battle...