If I understood correctly this means that you might wake up on a Friday and see that one of your players has an arrow in both categories
Driving and handling are very, very similar skills, and training either one will now also result in about 80% of training on the other.
The problem is that we feel that not updating salaries midseason will cause some teams to be unable to plan ahead properly, because the game is young enough that it's not yet known by anybody but us how salaries will scale for higher-level players. So it's a question of whether teams would prefer to have to consider making midseason adjustments or whether teams would prefer to be unable to plan ahead until the offseason - both are bad, but we think this one is not quite as bad as the other.