Let's say I'm new to all this D&D malarchy with it's classes and feats and who knows what.
I create a fighter gather my party, save, and take on the Blighted Village. Not bad but what if . . . so I roll back to the save, respec to a sorcerer, gather my party and take on the Blighted Village. I can rinse and repeat that to my heart's content until I'm happy that I have a decent idea of what I want or need. A lot handier than scouring the web reading various people's opinion about this or that aspect.
As for the Larian or BG junkies. They could do something similar to experience all the dialogue options or whatever.
Or, shock-horror revelation, people who have no wish to respec can just ignore it.
