It's a usability issue, as has been explained. A computer user's eyes are naturally first drawn to, and focused on, the center of the computer screen at all times. It doesn't matter what the player's name shown in the top left corner is, or if the swing meter is present at the bottom of the screen or not. As long as you see the picture of a player who is a copy of your own player pop up in the center of your screen, this will distract many players who will reach for their mouse, thinking it's their turn to play.
Finally, no one says new outfits should be the absolute no. 1 top priority for WGT and they should abandon all work on everything else. They have a team of programmers, and fixing the colours of shirts/pants/skirts, at the very least, should be relatively easily manageable without affecting the programmers' work in other areas.