Pet Peeve alert.
It's a bugaboo because people have deliberately made it a bugaboo. People say dumb shit like "Corsi," "Underlying numbers," "analytics," instead of just saying shot +/- because they want it to sound fancier and more complicated than it really is. Nerds love to make things sound as complicated and advanced as possible to make it seem like only they are smart enough to understand it. We always do this and then we wonder why people don't trust the numbers that we cite. It drives me crazy. I hate it when people say "He has good analytics." That means nothing. Nobody in baseball would ever use that sentence ever.
If we would just call it Shot +/- everyone would understand what it is without too much trouble. But then we'd be exposing that it's not fancystats, it's not moneypuck. It's not "advanced analytics." Because, well, it isn't.