the Midgar only bit could be a problem, in general FF always featured multiple regions so I wonder how much variety there is (can we explore the outskirts at least? that same setting for 40 hours could get tiring).. and how much gravitas there is in the story to carry an entire game during whats essentialy the beginning of the plot.
I, myself, am fine with the first part of the FFVII Remake being Midgar only, especially since we're getting more of Midgar itself, and other than additions and/or changes to the story, I'm expecting the same, but an evolved version of the FFVII story in this multi-part series, so I barely have any expectations towards the story, as I said, I played and beat FFVII's PS4 port, and I'm fine with this current structure as long as it's fun, and the combat already looks like so much fun. I'm also happy we got a release date for the first part. But I do understand what you mean, especially since this is all just my opinion. Though, if they keep Aerith alive or revive her somehow after her death, I wouldn't be happy about that, as I feel her death as essential to the story.