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I am a native speaker. I have no idea what language you are describing. 1) Arabic is highly expressive, the number of ways a root word can be morphed is astonishing. In fact, I would guess it’s unmatched in expressiveness. 2) grammatically speaking, it’s very simple. A little kid can tell you when something is off in grammar. Why? Because Arabic is a language where the semi-vowels indicate the grammar. And because of this, a grammatically incorrect statement will just sound weird. This ease is why most (educated) native speakers have learned grammar at a young age. They will have poetry memorized and understand grammar in a fundamental way.

You know, and I don’t mean to question the veracity of your statement, I don’t think you are a native speaker at all. I think you grew up hearing enough Arabic to understand it and speak it. I would bet you speak and think in English and not in Arabic.