I think Joe needs to hold firm but I really want to see this resolved before training camp. First off it's a distraction for our young players, vets, coaches, staff, and fans. It sort of hangs over the organization as a dark cloud. Ben Simmons was different as he wasn't the teams best player let alone an all time 76ers great. Simmon's was more similar to ZBo here, yeah a situation that is nice to resolve but nothing historical to the franchise.
Second is the risk Dame gets injured, plays poorly, or a trade partner no longer wishes to add him. If the Heat or other team get out to the East best record they may no longer want to break up their starters to trade for him. Or if they lose a ton they may fear Dame wouldn't make them a contender and they'd be reluctant to give up future picks.
So there is no urgency to get this done in the next few weeks. But there is an urgency to get it resolved in the next few months.