I agree with that thinking. I am also thinking that it would take a very good archer to tell any difference between arrows fletched with all one colour or all three different, or two the same and one odd.
Any archer could run tests to find out what difference it makes.................. to them.
But would the time be well spent? Heehee!
I remember days when the same arrow came out of my quiver first, time after time. As they were dropped into my quiver in no particular order, there was no reason for one to end up in an easy to reach position.
I also remember days when a particular arrow ended up low, time after time.They were not shot in any way that could create that deliberately and the numbers were so unclear I could not read them without putting in a lot of effort; which I didn't.
Next time. that same arrow stayed in the group. I put these things down to chance; just like you can roll four sixes in a row; then not get a six all the rest of the time.
If an arrow is consistently out but in the same relative position, it can be aimed off to counter the error.