What is the tradeoff between privacy and implementation complexity of Dandelion (BIP156)

What is the tradeoff between privacy and implementation complexity of Dandelion (BIP156)

Dandelion is a new relay protocol for transactions on cryptocurrency peer-to-peer networks. It has been heralded as a huge privacy improvement for cryptocurrencies at the networking level– I'm wondering what costs this comes at.

  1. Does Dandelion introduce more complexity into the code base?
  2. Are there possible attack vectors introduced with Dandelion?
  3. What is the hold-up with implementing Dandelion in Bitcoin Core?
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