symbolic point of the fight.
but… the point of the fight was to hold off the First Order. Whether Luke was actually physically there stalling them or “force-projecting” himself into a fake fight, the point of the fight remains the same either way.
In theatrical TLJ, it was never about stalling through a fight. Luke “won” the moment he stepped onto the battlefield.
The way I see it, Luke’s real goal was humiliating the First Order’s leadership. It’s because the idea, the spark of hope is always stronger than what’s really there.
So Luke walks up to an entire army and the supposed all-powerful leader, Kylo Ren, is unable to recognize he isn’t making any footsteps. Kylo then fails to realize Luke couldn’t possibly have the destroyed saber. This is because everyone is either scared/awed, or angry at their enemy. Luke basically insults them by giving them numerous outs: none of which they take.
Where does that leave us with? Well, to the average stormtrooper you just watched your supposedly invincible yet recently installed leader get played like a kid. The resistance escaped because Kylo was too busy playing with his emotions to think logically. Now you are questioning the First Order’s leadership and are in awe of the other Jedi, who could force project behind you at any minute for all you know. A good way to mess with morale, Master Skywalker.