The ending doesn't make sense? Spoilers Farseer & Tawny Man

[Witted Bastard]

Yes, Kettle did explain to Fitz that he loved the idea of him and Molly more than the reality, but he did not agree. I also find it perfectly plausible that old and wise as she was, she could not see all of Fitz and misjudged the relationship.
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As for whether Molly is TRULY the right person for Fitz, I say yes. Even as early on as AQ, Fitz tells us that all he really wanted for himself was to go home to Molly and live a simple life, but he is denied this. As the reader we may harbour a wish to see him publicly acknowledged as a hero, become the king, run away with the fool etc, but a simple life with Molly was what FITZ most desired, even if some of us may think he should wish for more.

And Fitz is known for always having a good idea of what he truly wants, eh? Sorry, not buying it. The 'happy-ever-after' eventual reunion with Molly goes against everything the reader had been taught to expect in the prior 5.8 books.

I dare say that we are meant to ponder about the love in Fitz' life Jinna refers to, and wonder whether it's Molly or the Fool. In the end, it could be either or both.

Wrong. It's the Fool and no mistake. Molly doesn't twine in and out of Fitz's life at all for 18 or so years (just prior to Regal's dungeon until after returning from Aslevjal and getting stuck in the outer reaches of the Skill). At most he watches her from the periphery of his own isolation. Molly is the substitute match after Nighteyes and the Fool are both lost to Fitz of necessity.

I found the fact that Fitz had been partially forged for years an excellent and plausible twist.

This is so totally false and untrue that I can't believe anybody buys it. Everything we know about Fitz and Hobb's universe must lead any faithful reader to doubt it. How many times does Fitz talk about how damage to the soul heals and scars much the same way that damage to the body does? Not to mention that he obviously continues to carry within him some memory of his time in the dungeon, which comes to the forefront after he brings the Fool back and struggles with helping his friend bear the pain caused by his torture. The restoration of whatever parts of himself had been stored in Realder's Dragon seemed to be a convenience to make his reuniting with Molly even remotely plausible.

Basically I found that everything after the month Fitz spent within the Skill Pillars - or wherever he was - to be a quick and sometimes messy tying-up of several threads. It seemed to me that the author didn't know how to bring the story to a close. And that's not necessarily a criticism, since she has admitted that she hadn't envisioned any sort of ending coming at that point in the story, so it must have been hastily engineered. Well exemplified by Elliania's sudden reappearance after a seeming impasse with Oerttre and her mothershouse, leaving the reader to guess or imagine how that particular conflict had been resolved off-panel as it were.

As to those that see Fitz and the Fool's parting as false, I suggest that the Fool himself addressed those concerns more than adequately. The Fool may no longer have been able to see himself in the role of the White Prophet - or perform that role - the fact remains that Fitz was still Changer, and it's perfectly plausible to me that to have a Catalyst at the height of his powers paired with and influenced by a Prophet bereft of his own would be tremendously dangerous.