Great match by Ding and Ian both, and I honestly think Ding deserves the win in the end. I think Ian got a bit too results oriented and pragmatic towards the end of the match, playing too imprecisely and quickly in key positions and always a little too happy with a draw. Ding was just playing chess. And as often happens in chess, this ended up being the decisive psychological factor. Ian, going for a repetition, And…
I wouldn't agree with the "deserves to win". If you look at the classical matches, probably Ian had the slight edge, and tbh, he could have wrapped up the entire thing in Game 13(I may not be remembering the exact game, but the one where he had a strong position but gave it away and lost, thus leading to a tie). And, honestly, in rapid, they were really really even. Even one better move at the end might have tied it…
That's why I think the final game became sort of a microcosm of the match as a whole. Ian's concentration slipped and he was thinking of making a draw, and the match situation, and not the position at hand, and when Ding rejected the draw he was too flabbergasted by it to handle the position whereas Ding just kept calculating.
It was a very tight match, and both players would have deserved it had they won they tie break. But I think overall in decisive moments Ding was just a little bit more collected and concentrated, and that's why he ended up winning.