On the whole stronger players like having postmortems because recongise both sides learn and get better in the process. Weaker players are keener about hiding information, especially about openings, for competive reasons. The funny part is quite often they don't have anything worth keeping secret.
Sharing your repertoire, good or bad?
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Yes, I agree. Chess has very many FINITE variables....and I am saddended to learn about the cage situation. I hope you are released soon into the daylight of understanding.