Why was G-d's only direct interaction with the Jewish nation be limited to two commandments?

Question

Following "what-went-wrong-at-matan-torah:

We claim that Matan Torah was/is the ultimate proof of the veracity of the Torah, because unlike what we observe in other religions, where G-d never makes direct contact with the people, at M"T G-d spoke directly to the Jews.

That made me think, since:

1. G-d loves His chosen people and only wishes good for them
2. at some point at M"T The Israelites have reached the level of prophecy anyway
3. the event was miraculous anyway it could last as long as G-d wanted
4. the scarcity of clear commandments from the source has led to numerous misunderstandings, quarrels, and incidents in the wilderness and after

G-d could easily use the moment to pass the whole written Torah (or the Oral also).

Why was M"T limited to two commandments only?

Answer 1

The Rambam takes a very natural approach. That Moshe wrote the Torah by studying the divine laws of nature. Maimonides' view of prophecy is not consistent with Sinaitic revelation. How does he reconcile the apparent contradiction? Rambam says that the Jews (collectively) could understand the first two commandments (1) G-d exists and (2) G-d is One. they are simple philosophical expressions that anyone could understand with ease. They could not delve into the other deeper commandments of the Torah so Moshe went back to the mountain and spoke with G-d (metaphorically).