I like to pay attention to the nocktravel on my bows, but i cant see it. Those arrows travel to fast for my eye. So i looked little different at the subject.
For 3d i need speed and a flat trajectory. When i place my arrow completly square and level behing my string and the arrow over the same heigt as the arrowrest bold, i make as much speed as possible, shown on a digital speed device.
My 3D bow however was not delivered as a bow with a 'strait nock travel' .
My huntingbow does.
Eventho, on this bow i choose a little high nocklocater to get as much clear travel over the rest and so, less sound.
For my huntingbow i did not need speed as much as i need silence and impact.

The thing that makes you thinking about nocktravel is papertuning.
How much do we all want those perfect bulletholes while nobody sets up his/her bow for shooting on a piece of paper.
Papertuning is handy for adjustments on spine.
Nock travel is a thing that comes with your choice in setup.