If Aerith had lived, I can imagine a scenario in which she and Cloud end up together and a scenario in which they don't.
The game doesn't leave us any choice, in fact, over the LT. You're supposed to get *everything*. Cloud hugs Tifa (it's romantic, and it's true Cloud showing up), he listens to Barret before dreaming of Aerith. You get all of this. Even if you skip it, the game considers that it happened anyway. Cloud will say he feels called. Madam M will tell you people have seen a weird guy in Elmyra's garden (or something alike). Tifa will give hope to Leslie with the flower. The game is telling you that all the resolutions happened, whether you want it or not, as the player.
I think fans tend to forget 2 things from the OG that are absolutely all you need to argue for the LTD:
- Cloud tells Tifa that it's only her opinion that counts. At that time it's before he even finds himself back, so that's how he feels regarding both Aerith and Tifa, while his feelings are still hidden. In my first playthrough, I thought he preferred Aerith, but he was suddenly saying something so bold?
- The Lifestream scene is the resolve of Cloud's feelings, the answer to the LT. May you have been paying attention to her or not, it's Tifa whom he loves. I've seen plenty of times some cleriths wishing Aerith would help Cloud instead of Tifa, and I'm like "are you crazy? So that she'd witness how his head is full of Tifa? You want to hurt her that bad?"
With just those two scenes, you should realise that there is no "LT" at all. That cleriths ship clerith and enjoy their interactions (they are cute and made to be enjoyed), and invent AU worlds for them, I have absolutely no intention of stopping them. Shipping should be fun and about enjoying your ship. Should they come and treat like Cloud doesn't care about Tifa, that the only thing he wants is to meet up with Aerith in the Lifestream, that FFVII should be interpreted as an otome game should, is absolutely where I draw the line because... that's not FFVII. That's not the story about loss and how you deal with it. That literally goes against the very core message of FFVII. And these characters are definitely not Cloud, Tifa and Aerith.