What you're doing with a figure eight is creating a giant
capacitance, much in the same way that the twists in your mic and data cables does. Oddly, over-overing your cables will destroy that
capacitance which is why we over-under them. The twists, especially in data, are remarkably important to the quality of the end signal. EVERY TIME you over-over your cable, and then pull it straight, you're changing that twist, ergo that
capacitance.
Ever wonder how those multi cables and
Edison cords that start life out straight end up looking like an old Ma Bell
handset cord? Mistreatment, via over-overing them and pulling them out straight. Over-over introduces a twist into the cable; over-under does the same, but then unwinds that twist every other turn.
Over over clockwise is a leftover from the days of twisted hemp and
manila. It's so you don't unlay a rope. If you're an anachronism on the
deck, continue as you have been.
Today's modern technician is much more than a deck-hand hired as beef, he knows what the cables do, how they do it, an HOW TO KEEP THEM DOING THAT. Unless a cable is going to go on a reel, or maybe into a box and from the box straight into the air, the best way to preserve that cable is to over-under it.
And spend a second at the end of every wrap to make sure that the ends are not going to go through the loops. Poorly wrapped cable is a problem, and not paying attention to where the ends go is a definition of poorly wrapped. If they mate, mate 'em. It not only prevents knots, it prevents dust and dirt from getting into your delicate connections, and keeps the ends round and straight. Egg-shaped connectors are a drag. This solves a myriad of problems.
And for the OP, it doesn't matter how long you've been doing this, or who you've worked for, or what shows. If you've been doing it wrong all this time, it's still wrong. And yeah, even professors that used to be pros can make mistakes.