I never understood why they cast such a potentially brilliant Doctor and then undermined him so brutally with the writing.
The Capaldi disappointment is the biggest tragedy of Modern Who imo.
And when he said "Doctor I let you go!" so affectingly it actually took the words out of my mouth.
I will still post info on the show impartially, but it seemed an apt personal departure point imo.
Thirteen Doctors if one counts John Hurt and doesn't count Handy.
A complete regeneration cycle.
The end.
(N.B.: Just strange that, as the Doctor's consciousness entered the Matrix, he imagined he was a woman as he died.
Perhaps he was fusing with the consciousness of the - female - Tardis as he entered eternity. Together forever.
And that is why the Doctor said "Oh brilliant!" They would never be parted.
We even saw the Doctor/Tardis combo falling into the Matrix, into the depths of death....
Anything after that is adventures in the Matrix afterlife.
Which can be ignored.
Anyway, that is my crazy, highly far-fetched, "personal-head-canon" conclusion.
And it took a lot of hammering with a mallet to make it even half-work.) 
The show will go on, of course.
But the time was right for me.
For I was never happy with the idea of a new regeneration cycle, as it was obviously motivated solely by the need to keep this money-making, highly profitable franchise going here and now, when the thirteen lives iteration should perhaps have been adhered to, bringing this iteration of the show to a natural conclusion.
The character of the Doctor could then have had another rest, - until someone then wanted to create an entirely new take on the character/show, that would have been a complete new entity, as Sherlock Holmes, Tarzan and other flexible and famous literary characters will testify.
