When your coins are waiting to be coinjoined they the software has to be ready to sign. If it was part of a hardware wallet solution you'd have to stay next to it to authorize at the right time.
I think this is overall a cheaper and more convenient alternative to converting your BTC back and forth other privacy coins.
And why not use the benefits of both worlds? Only time will prove which of the two will give the superior results. I see it like wealth diversification. Only this time in the privacy world. Like an extra layer of protection, or security.
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!shitpost