Here is my Idea:
Why the Employee can only become better when they make the Training options why they not getting better when they work at games
example:
Employee One working on Engine in the Dev Phase so he had a chance to become better in the Tech Category and a low chance to get a point at speed
Employee 2 working on Stoy/Quest so he had a chance to become better in Design and a low chance to get a point @ research
and so on
sorry for the bad english