I couldn't agree more.
;D
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I'd like to see famous FF weapons make an appearance instead of the characters.
Yoshida already said, no character who died in his (or her) game.
So, no Sephiroth
Lighting was here because the whole premise of the trilogy is her Quantum leaping throughout Space and Time as a Cosmic plaything. We were just a stop on the road and the Fate monsters were sent to keep her suffering in battle. Shantotto will pop in from a Warp spell gone wrong presumably because she's so powerful she accidentally overclocked it; Gilgamesh is just going to be here because he's Gilgamesh. I don't think other FF5 characters would pop in because the worlds they traveled between where just two pieces, the united whole, and the former space between the same world. FF7 characters don't have any reason (in there own game) for jumping to other realities, which is why Kingdom Hearts is not an excuse.
FF4 Characters could theoretically fly to Eorzea via the Whale ship or another false moon. FF6 is probably too busy repairing their own world. FF8 might be able to hop realities (never played, just read synopsis about traveling through space and Time loops). FF9 might too, but they'd likely be belligerant since the last alternate world they linked to was parasitic. 10 and 12 are self contained.
Although Lightning appearing is a cross promotion to hopefully sell some copies of 13-3 lore wise you can pull this off as she is travelling through time and different dimensions / worlds. Cloud showing up randomly one day would not make any sense from any standpoint of story telling and as much as XII has a huge fan base this would just be pandering and a bad idea. You can take other elements from XII and it works just fine such as the casino but random introduction of characters would be silly for the sake of being silly.
I still think a Kingdom Hearts event where you help Sora lock Eorzea's keyhole would be cool :p It doesn't break any of the rules they laid out either. Might be a bit of a stretch though.
If we don't have Celes Chere appearing as a Garlean General enlightening Eorzea with a Magitek Knight/Rune Knight Job; and if she doesn't bring Locke Cole along with her, I will be sorely disappointed!
Better get used to the idea - He said before you even loaded up ARR that XIV ARR will be a fan service title. We're getting a FFXI FATE and that game is 11 years old with no new expansion coming out any time soon (one just came out), so..they already kind of do what you hope they won't do.