Is there a way to check why a BIP was rejected ?

I was learning about Dandelion proposal (BIP 156) and I can see on the GitHub that it was rejected.
I'd like to know why. But it seems there is no documentation whatsoever about the rejection reasons. I also tried to google it but no result.
So this is no only a question about this BIP, but a more general question. Is there a place to see the reasons of why a BIP was rejected, accepted, replaced etc... submitted by /u/Tyranoc4
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