But those don't apply to darksend.
DarkSend is a variant of CoinJoin, using a new scheme of centralized mixing nodes. It does apply.
That's an easy shortcut. If someone criticizes the first car ever made, does it also concern the ones made now ? Coinjoin was a base, but there were a lot of improvements and innovations (And there is more to come).
Cant see clearly how a bitcoin coinjoin is = darksend , I know it is based on similar principles, but they are not equal
Edit: and those papers on CoinJoin Sudoku applied to Bitcoin, not darkcoin. Show me a DRK transaction that you can trace and then I will believe you.