He is talking about the internal perceptions of different types, not their abilities, talents, skills, IQ, or EQ for that matter. Using your example he is not saying that "LIIs build systems that describe the universe" but that "LIIs see the universe as if it's built on systems". That's quite a different matter.
Thank you.
But, for a certainty, back then,
We loved so many, yet hated so much,
We hurt others and were hurt ourselves...
Yet even then, we ran like the wind,
Whilst our laughter echoed,
Under cerulean skies...