It's not that bareshaft tuning is important...it's just tuning that is important.
As long as you do some form of it...whether it's bareshaft, paper, broadhead or just trying to match an arrow's spine by looking at charts to your draw weight and draw length...you will improve your potential accuracy by having equipment that is tuned to each other.
Facts:
A tuned arrow can be more forgiving.
A tuned arrow can help an archer be more consistantly accurate.
Arrows with broadheads can fly better when they have been tuned to the bow or vice versa.
A tuned arrow can penetrate better than one that's not.
The level or degree you tune is based on your ability and/or desire.
Some of us are very anal.
Some of us believe good enough is good enough.
And than there are some of us like George who have been doing it for so long...just know what arrow will shoot good out of their bows
Ray