You are the exception then ,, I know lots of guys that will not pass a 50 yard bow shot and will tell you they are comfortable at 60 .. Or maybe i know alot of morons .. I do not bow hunt just for that reason .. you need too get close .. I much prefer a long range rifle
I have also used a spear... the distance was six feet... I passed up a fifteen FOOT shot as too far... the choice of tool isn't the problem, often the problem is pushing the tool beyond its capabilities and even MORE common is the chump using the tool pushing beyond his/her capabilities. There is more to take into consideration than even ballistics and skill... emotional state (buck fever etc...) and environmental conditions come into play as do other gear being utilized.
I can't think of one good reason to not be certain of a shot BEFORE taking it... and that still doesn't guarantee a desireable outcome.