How does it give you Privacy if they only allow UTXO's they trust to enter the Coin Join process.  At that point, for what is worth,  they may only allow UTXO's Blockchain Analysis companies have been able to decypher and identify.  What about this.  The point of a Coin Join was to gain Privacy.  If you have say 20 UTXO's but you know who each of them is.  Now your list narrows to only 20 people.  Or, maybe even less.  Now Coin Joins are simply useless.

Of course this is just a theory.  But is it not viable?  Wasabi is pro censorship.  Coin Joins, not really.  Wasabi is.

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Regards,
PrivacyG