I'm currently playing Wizardry 8 , and there I noticed something interesting:
A "skill" - basic attributes, that is - is represented in numbers.
Reaching the number 100, this "skill" / attribute - for exanmple strength - unlocks another "expert skill", because 100 is the highest number possible.
I had expcet (lol) something happening when "maxing out" (where does this term come from ?) a certain skill, but there never happened something extraordinary ...