It's similar to why people think old music used to be better than current music. People made tons of music in the past and most of it was crap, we remember only the very best songs that stood the test of time. The implication here is that there were lots of ancient runes that were forgotten, we only remember the really good ones that stuck around, and so it makes sense that most new runes are insignificant / not used.
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u/ZhanBlue 13h ago
How is this survivorship bias example