Revert Conqueror to 3seconds ranged

Conqueror was nerfed to 2seconds for ranged champions back when one stack was giving 15(hotfixed to 10) adaptive force. At this point it is giving 6AF at level 18, up to 5 stacks which means 30 total instead of the potential 75(50) of back then. So why hasn't it been reverted to 3seconds duration? 2s is just way too low and just not optimal on most dps ranged champions that want to kite in and out of combat such as Cassio and Ryze. It's is such a fun rune but being forced to either kite back and lose your stacks cause the duration is too short or facetank and keep your rune stacks is just two extremes. What are your thoughts?