This is a follow up to: Why was Torah sheBal Peh not allowed to be Written?.
The Gemara in Temurah (14b) states that one may not write Torah sheBal Peh. It then states an exception that was made so that Torah would not be forgotten.
ותנא דבי רבי ישמעאל: כתוב לך את הדברים האלה - אלה אתה כותב, אבל אין אתה כותב הלכות! אמרי: דלמא מילתא חדתא שאני; דהא רבי יוחנן ור"ל מעייני בסיפרא דאגדתא בשבתא, ודרשי הכי: +תהלים קי"ט+ עת לעשות לה' הפרו תורתך, אמרי: מוטב תיעקר תורה, ואל תשתכח תורה מישראל.
Similarly, the Mishna and Gemara were only able to be written because otherwise Torah would have been forgotten from Israel. The general prohibition seemed to have been kept for other writings. (Even after the Gemara was written, the Geonim refrained from writing other works.) Yet what allows any work of Torah to be written nowadays? Not every work is preventing "Torah from being forgotten from Israel"!
