I'm more in the camp that the LTD is the writers' fault. I don't think the devs have "always been clear" about CT endgame, but this is just my subjectivity. There is no way to say objectively what is a "clear" relationship in any media.
To explain further, I think the devs intended CT to be endgame, they just presented it poorly, and in some cases, this was intentional. Moments like the hand reach at the end of OG and the "I think I can meet her there" line, add just enough ambiguity to put Cloud's feelings into question. We have to wonder why they decided to change it from an earlier version of that scene where Cloud mentioned Mt. Nibel, "We'll see the other side of the mountain", showing that Cloud and Tifa are discussing a shared memory. Then they changed it to a vague line from Cloud that
could refer to Aerith. It strikes me as a bizarre decision, because the previous line sounds much more poetic and appropriate to the situation.
If the devs wanted to solidify an endgame ship, they could have done that with AC, but instead they decided to be vague about the CT relationship intentionally. Nomura admits this in that interview when he says he "has no idea" if Cloud and Tifa were in a relationship. This is a complete lie. Nomura directed AC and talked with Nomura about the characters he wrote. Nomura knows if Cloud and Tifa were in a relationship, he could have given a yes or no answer. What's even weirder is he just stated this out of the blue when the interviewer had in fact asked about Sephiroth's love life. He could have just said nothing about Cloud and Tifa and let the audience come to their own conclusions.
There are many instances like this that are worthy of criticism. And it isn't just because I prefer a certain ship, but moreso because it undermines their own storytelling. How are we supposed to care about Cloud finding the courage to protect his family if we do not know who Tifa is to him? If it was made clear early on that they were in a romantic relationship or harbored feelings for each other (which isn't hard to do for most filmmakers), this adds a whole new dimension to Cloud's struggle. Most movies and plays just tell you if certain characters are in romantic partnerships, treating it like this obscure, secretive easter egg is detrimental to the plot.
Add to this the fact that OTWTAS was released in the US
three years after AC, to coincide with ACC that changed certain scenes. So yeah... the entire LTD is squarely on the shoulders of Nomura, Nojima, Kitase, etc. etc. They've put themselves in a position where, if they do solidify a canon pairing, it will seem like a retcon to a lot of fans.
