I think it really depends on how much room you have inside the track too. The type of sheathing on the wires as well as wire sizes may play a roll. I just observed how they acted while moving and decided I did not really need to tie them down. Even though there is a lot of space left in both of mine with cable track, the cables pretty much keep themselves aligned and ride in in virtually the same locations each time.
I don't think it is detrimental either way.