Does anyone here think it could be both girls in the romantic sense?
In the romantic sense no,
Trying to explain from a structural perspective: Tifa’s character arc involves her being the solution to the MC’s internal conflict, and while Aerith is equally important to the plot, (and even though I personally prefer her over Tifa) her character arc doesn’t necessitate her to distinguish between Cloud’s soldier persona and his real self/identity (which is the focal point and story objective of
his character arc;
him accepting this distinction is what leads to a satisfying ending; coming to terms with his insecurities, weaknesses and his losses which eventually makes him stronger) So in this sense, it’s clear to me that one girl is the intended endgame love interest.
But I can see why many argue it’s left to interpretation, (or that CA is romantically ambiguous) because with the entire comp in mind Cloud and Aerith still obviously have a precious and unique bond, and from a character POV standpoint, even though you can argue cloud didn’t develop feelings for her in any point of the story, the devs still made the conscious choice to portray their scenes in a way that
can be interpreted in a romantic light; they certainly don’t want people to
stop shipping them (in which case it’s still unfair and I believe intellectually dishonest if anyone tries to argue Cloud
only loves Aerith and not Tifa, because even if you think he has romantic feelings for Aerith, then you can’t just deny his behavior and intentions towards Tifa; that’s ignoring a significant point of his character).
And also, I find it strange that many don’t share this sentiment: but as an Aerith fan, I have no problem with fanon multishipping and headcanons, but I still don’t get why people would want Cloud to be her canon and endgame love interest especially after seeing the lifestream sequence in OG, and especially after Rebirth, where he kissed Tifa. He manages to swoon Tifa off her feet and after that he gets Aerith too? Maybe that’s just me, but I don’t like that interpretation of his character, and I never liked the idea of Aerith still being in love with someone who inevitably won’t return her feelings because one of the big reveals of ff7 is from the start this guy’s devotion was already reserved for someone else.
I saw a shift in how they were developing him and Aerith's story and it's basically with Her not being sure she likes Him in that sense. And him completely oblivious to her feelings in the first place. Then him finding out about Zack being Aerith's boyfriend who in his eyes she still is head over heels for he needs to tell her what happened to him. This way the devs don't have to say anything about Cloud's feelings. He remains oblivious because he now has no reason to entertain Aerith having feelings for him.
I personally don’t agree with the interpretation that Cloud remains oblivious to Aerith’s feelings in the entirety of Rebirth, we saw him initiate undoubtedly romantic acts towards Tifa at GS, and we’ve seen him push away Jessie’s advances in Remake; he may be awkward and mentally stunted but I think he knows his social cues and is able to distinguish the lines between platonic and romantic. His dynamic with Aerith (at least since Remake) had always been indulging her wishes. If I were to put myself in Cloud’s shoes, I think I’d eventually understand that this girl is into me (at first cause I reminded her of her first love), she’s become dear to me, and I have fun spending time with her, but also when she tries to confess to me the first time at GS I’m like “You really need to know what happened to that other guy you still like after not seeing for a long time who you keep comparing me to” and at the end of it after holding her hand I feel like I didn’t even do anything. The dream date was confusing for Cloud because it was clear Aerith knew more than she let on but I don’t think he was unaware of the implications of that experience, he saw that yellow flower pin and remembered it’s Leslie’s gift to his girlfriend, the GS date was Aerith’s optional confession, while the dream date was the confession/resolution between the two characters that the plot demanded.