Adding, without contradicting previous answers:
Halakha needs to be responsive to different societies and environment and this is the role of Oral Torah v. things that are eternal and are written down. Part of our avodah is for each generation ti struggle with issues of the time – whether entering EY, or galus Bavel, Romans, pogroms, freedom of religion, Covid … We clearly both gained and lost by writing Oral Torah down. We gain ability to better argue across generations and benefit from their knowledge. But we lost some by having it necessary to process every decision thru all amoraim, rishonim, and ahoronim. This probably leaves Talmidei Chachamim less sharp as they don’t need to solve issues from the first principles the way Tannaim did. (and that is why we have too many claiming the title)
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