I used PP to upgrade to FC on a 777-200. A lot of empty seats, a lot of space between pax.
Now its a 738 with 16 seats totally full in FC.
At least if they had changed it to a PMUA 757 there would be 28 seats upfront, and more space if they controlled the upgrades.
Alaska is blocking all middle seats in coach and limiting upgrades to FC for social distancing.