Thanks. As AdamISZ says taproot isn't needed for vanilla coinjoins but it could be beneficial for the privacy of people using both JM and lightning.
Can taproot replace coin join and other mixing services?
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No. Taproot by itself is not a silver bullet privacy tech. Taproot just allows theoretically to do better stuff with coinjoins, etc. Actually taproot can sometimes even worsen your privacy, before there is more adoption of it.