I think this all comes down to personal preference, it's the only way I can look at this, truth be told, the exact same can be argued for any other character. It's just a preference on which characters you like and dislike.
What I prefer is a character that is human, and flawed as the rest of the cast. I don't want the game to try to make Aerith and Tifa equal love rivals. I think what makes FF7 great was the fact that the love triangle was never fully equal but two contrasting characters that although both affect cloud and his thought process, affected different areas.
I'm afraid that by splitting up FF7 into multiple parts, its going to pad out character development and give them a baseline personality.
Also, I don't know what planet you guys live on but I didn't get bratty from the OG... Poor girl's just misunderstood.
Well bratty wasn't the words i use, but here is text that might give you context:
Tifa: Marlene! Aren't you going to say anything to Cloud? Welcome home, Cloud. Looks like everything went well. Did you fight with Barret?
Tifa: OHH!! I can make a drink just as good as anyone else. Everyone says, my drinks taste the best!
Tifa: So! You're really leaving !? You're just going to walk right out ignoring your childhood friend !?
Cloud: What......?
Tifa: So you DID forget.
Tifa: I'm going inside too! I wanna see!
Sephiroth: Only authorized people are allowed in. This place is full of Shinra's industrial secrets.
Tifa: But!
Sephiroth: Take care of the lady.
Tifa: Mm, man! Better take real good care of me then!
Tifa: ......... Cloud...? How bad was I when Sephiroth cut me?
Tifa: Hey wake up. Wake up, Cloud!
Cloud: Tifa... When Sephiroth and I went to Nibelheim, where were you?
Tifa: ...We saw each other, right?
Cloud: The other time.
Tifa: No...it was 5 years ago. I don't remember. But, something seems strange outside. Cloud, come quick.
Hmm... I disagree. I liked her voice. I first would've loved Jessie's voice for Tifa, until I actually heard more of Tifa's voice actress in game. I think it suits her personality. I don't think it sounds "old/older", perhaps it has a maturity level to it, but I feel like that compliments her character well.
I think suiting a personality isn't enough. I think it doesn't fit her physically. Tifa's voice is deep and very controlled. And yet, the expressions she gives don't fit her facial features.
Just hearing the Japanese voice actress gives her a more timid, but also younger tone. It really reflects the inexperience she has.