I see that. I just don't want D&D to be contorted into one of those systems. Let D&D be D&D, and let other games be other games. I'm all for innovation, I just think you change the stats that much, it stops being D&D.
Maybe it is possible to compromise
TOUGH/FORTITUDE
• Strength (size, damage bonus)
• Constitution (health, hit points)
ATHLETIC/REFLEX
• Athletics (speed, run, jump, climb, balance, tumble, fall, swim)
• Melee (melee attack bonus, grappling, dodge, throw attack bonus)
PERCEPTIVE/PERCEPTION
• Dexterity (senses, steady hand, missile attack bonus)
• Intelligence (lore, deception)
SOCIAL/WILL
• Charisma (empathy, persuasion, fear-mongering, entertaining)
• Wisdom (willpower, sanity)
In this sense, one is really adding two abilities to the six. The default can be 4. But optionally a player might prefer to divide the four into eight by giving each bifurcation its own score.