I read the article “Who Wrote the Ten Commandments” By Benjamin D. Sommer, which you linked on Shikul Da’at:
As I understand this “apparent” dichotomy; HaShem wrote the Ten Sayings on the “blank tablets” (which Moshe “shaped” from raw stone) with His “finger” as a guide for each “Saying” and then Moshe carved (chiseled) each and every “Saying” into the surface of the Tablets. Thus, there is no contradiction between 34.1 and 34.28. Both did the “writing” – while in the second case of the Luchot, only Moshe did the “carving,” engraving, or chiseling of the “Ten Sayings” – a little imagery is necessary to explain why Moshe had to spend 40 days and nights on Har Sinai a second time….
HaShem was Moshe’s Teacher (Moreeh) patiently waiting while he carved each saying and again explained the Oral Torah (“she ba’al peh” which was written on the first set of tablets).
Shema Yisrael Torah Network –
“Horav Aharon Soloveitchik, zl, explains that one can acquire something in one of two methods: kibbush and chazakah. With respect to taking possession, kibbush refers to acquisition through the medium of brute force – such as a war. Chazakah refers to acquiring something slowly, meticulously, through the peaceful process of cultivation. Concerning educational knowledge, kibbush is manifest in the approach whereby a student is overwhelmed by a multiplicity of data all being taught at once, whereas chazakah is embodied by a slow, systematic process of teaching one thing at a time, allowing it to “settle” and then build on it.”
HaShem did the “pointing” and Moshe did the “writing” ….
Yochanan Ezra ben Avraham