Being positionless doesnt mean doing all 5 positions? It just means playing roles outside your positions which means you cant be defined as that particular position. You could give roles that are meant to be for a certain position to another position.
Example:
Point Guard = Playmaking, ball handling, Floor Leader
Shooting Guard = Scorer, Spot up Shooter,
Small Forward = Perimeter Defender, Slasher, Versatility,
Power Forward = Set Screens, Rebounding
Center = Post, Rim Defender, Rebounding
1. Now everyones role is to rebound whether you are a big or a guard.
2. Power Forwards and Centers have similar roles today. Only PFs could stretch the floor at first and run the floor. Now Centers could shoot consistent 3s. Also with Shooting Guards and Small Forwards. Today you dont even know which is which unless the SG is significantly small.
3. There are literally lineups with PG - 6’8 SG - 6’7 SF - 6’8 PF- 6’8 C - 6’9. Point Guards could switch to bigs and vice versa.
There are still positions yes but again only to an extent. Especially with the offense that is most effective now ‘Flow Offense’. But you’re position doesn’t define your role. Your role comes from your physical attributes and skill set you have. watch Luka Doncic, LeBron James, Kevin Durant, Nikola Jokic, Giannis Antetokounmpo, Draymond Green
Also LeBron was playing PG this season right? And he was an all right rim protector.