At the same time, modifications to monstrous templates, the rest/death systems, updated patches from Bioware, updated haks from the Devs, and who knows how many other things could cause a current PC to be less effective than it was before.
If a player really considers that a nerf, change, or modificiation has been serious enough that it warrants a rebuild/relevel, I'm sure the folks that handle those applications will be considerate and reasonable.
Sometimes players need to take some personal initiative.