Who said it is? But we downgraded a position by spending tons of money, now think about that. The little time arthur plays he's inferior to Pjanic, and Pjanic was way more often available as well.
You're right that we could have sold Pjanic and went for a different player.
Imagine if we sold him to Manu or PSG or Chelsea for money and got Locatelli instead, while he was in the 30M range instead of 60M now. Or even Tonali. Freaking Jorginho would have been better than what Arthur has brought so far. You see? There are always plenty of options, but that's for the Juventus SD to figure out, not us.
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We got damn close though. Washed up old Pjanic went for 60M in a corona summer. Imagine prime Pjanic and with the pre corona inflated market. 120M easily