cant I just use Samourai's mixing functions ?
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This wallet doesn't have the same function on Bitcoin mixers, this is just a wallet that isn't a perfect way of taking care of your privacy.
Reputable Bitcoin mixers are still good to go for any pseudonymous transactions but when it comes to completely be anonymous, that's impossible to happen.

This is very common in crypto and the fact is, we can't hide it in every transaction, everything is traceable and even you think Bitcoin mixers are enough to clean dirty Bitcoin, to protect your privacy but isn't.  As many people say, (when there's smoke there's a fire), what is the purpose of using Bitcoin mixers and using P2P exchange if there has nothing to hide.  So that's was expected if you keep using these, you can get dirty Bitcoin, like darknet or even black market.

But I think this isn't something to worry about, we have many dirty transactions that have been considered as clean.  If you heard Silkroad raided and seized a huge amount of Bitcoin, the government put it on auction, and those who have to buy Bitcoin consider it clean.
If you have doubt, you can call these agencies that studied Bitcoin blockchain transactions to confirm Bitcoin transaction is clean.

• Chainalysis
• ScoreChain
• CipherTrace
• Elliptic