This illustrates something very important that has happened since the 50th Anniversary special. Nine, Ten, and Eleven have all suffered under the burden of being a monster having destroyed their people and the Daleks to save the universe. Each of them demonstrate a factor that demonstrates that guilt: from Nine’s pacifism to Ten’s desire to become “Time Lord victorious” and shape the universe to his will, to Eleven manipulating and using his childish demeanor to hide very dark acts. Keep in mind that’s around a thousand years of life if we include Trenzalor (during which the Doctor tries to atone). Now though, now The Doctor is free of that burden. He is neither the executioner of Gallifrey nor a man at the end of his journey. No hiding, no covering up, no lying.
And possibly more dangerous than Eleven dreamed of.