I was lucky enough to work lines on a DI match on Friday and spent the whole time making sure I knew who the BR players on both teams were.
Did it affect my calls, no. But after the game I felt like I was finally getting it and at one point I almost started to give the subtle BR Attack signal to the R1.
She of course had it, but I did get a little internal chuckle out of the situation.
PS- I love the Libero so that there are only 4 at any time to remember.