Fletcher3 is because of the extra hits.
Level 5 magic arrow= 15 hits
Level 10= 25 hits +400 more damage from skill (raw)
So yeah. If you want max dps with magic arrow fletcher 3 is needed.
But outside of bossing, magic arrow is useless. Rarely you can have somethign stand in it a long time.
And it’s actualy hits, that arent aoe ratio based. So only links would multiply it (* number of linked enemys).
Crossfire and Divine Arrow, are more likely why people go fletcher 3.
+25% damage bonus more duo 5 levels in crossfire more.
And an hard hitting 200% scaleing delayed shot with divine arrow.
(its (atk+skill atk)2 not atk2+Skill atk as described!)
You can chose yourself. What you rather want.
One thing is true for archer classes.
Atm rank 7 outscales many other dps skills.
My cannonblast with level 30 attributes atm does.
(800+4700)x3 x 1,3x1,5+crit atk 80…= 32,255 k damage on crits.
And with circling i can hit lots of enemys with it.
And it’s instantly xD.
But 10 hits of magic arrow (against an single target) more would outscale it (against a single target).
But heck.
Archer3 is still the god of pve …
Multishot+Circling= OP clear.
xD
Crossfire does alot damage… i only wish multishot had an higher skill atk… sigh