I have played the game for a few years and have seen many times the SA icon appear above my players wherever they make that vision pass, deadly free kicks etc, and I hereby summarise for this debate ----
1. SAs are important. Nordeus programmers aren't going to waste time making those cute icons floating about wherever a special skill is used.
2. Players hidden real abilities are even more important. I have players without SAs who are often man of the match and scores lots of goals and make lots of assists, season after season, and are often Cups top scorers and assists.