Well if you actually follow the numbers, its not really confusing at all. And how is the skill system confusing exactly? You get skill points, you look at what skills you want, and you spend your points accordingly.
I understand you follow the number but as a flow chart goes that one is really confusing for example
1 2 3 4 5 6 7 8 9 are in order
That PVP image read this way
1 9 3 4 5
All the numbers are there but and if you follow them you will get to 9 but i think the first way is much easier.