It’s literally devastating how much a point of view change can do. In the first two series the story is focalized through John and we see how very lonely and hurt he is and therefore Sherlock seems like this…almost cruel yet positively luminous genius who darts in and out of the frame with verve and brilliance and lightens everything just a bit and he maaay be hiding behind an armour, we know, but we can’t always see…
And all it takes is for the point of view to slowly swerve around and back on Sherlock to see that he’s trembling in the corner, clutching at straws, losing everything and that John is an endless reserve of strength.