Look at the Rabbenu Bachya at the end of Parashas Ki Siso how originally when they started to write down the oral law, they only were allowed to write down the essentials and the rest was self understood. As the generations became weaker, more and more commentaries became necessary. This is how the gemora came about. This is the meaning of a gemora’s expression indicating that something is missing. This was done on purpose , at that time, as it was understood without it.
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