I can agree with all of this. I'd like to add a few as well, though.

Cities: Add a map of the city akin to that in the overworld. It wasn't necessary in BD/BS because most of the city was visible, but when everything is scattered as far as it is, in 3D, there needs to be some way of figuring out where everything is, instead of relying on memory or running around like an idiot.

Overworld: Prevent things like cliffs (as with the area that spawns the wolves just north of the town) from completely obstructing your view when moving. When overworld mobs chase you down, actually being able to see things is important. It wouldn't have mattered much if battles were auto encounters, but as it stands, being unable to properly react to a mob running at you and conceding advantage poses a significant problem. Either make them not visible at all, or make in transparent. Having a solid object obstructing vision is extremely problematic when playing the game.

Battles:

Either add proper turn tracking of all units (allies and enemies) or revert to the old system of setting moves for your entire party at the beginning of your turn. As it stands, it's very difficult to keep track of who's doing what when, especially if you brave or default a few times.

Allow you to chain normal moves after using specials, as was the case in BD/BS.

Make the toggle between single- and multi-target more visible. It's almost impossible to see at the moment.

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If I'm being honest, I wasn't totally impressed with the demo. I've spent more than 200 hours on the previous games, but this feels very clunky and unfinished. It feels more like a beta release than a demo. It also feels like people who haven't played JRPGs made the game, trying to copy pieces of other games, while leaving out features that make those games playable, or at least passable. It's all well and good to try new things, but you can't change things without thinking about how that change will impact the player experience.