The combat was very barebones because it was a tech demo with many of the most basic combat mechanics unavailable. I think the fact you did not even have an HP bar until the boss should have made this pretty blatantly obvious.
It seems like the game uses dynamic resolution which for the PS4 varies between 1600x900 and 1920x1080 while the Xbox One resolution seems to vary between 1344x756 and something close to 1690x950.
The combat was very basic because this was a tech demo meant to show the new weather and lightning effects they added since Duscae. They said from the very beginning that showing the combat was not what this demo was meant to do. I do agree that this is not something they should have released to the general public.
According to Tabata, this was just a tech demo, so naturally most of the combat system was not available in this demo. As for the frame rate, as far as I know optimization usually happens at the very end of the development cycle, so hopefully they fix it by the time it comes out.
You have to take into account that this is a ps vita game. It just happens they decided to make an upscaled PS4 port. So naturally the game will not have exactly great graphics.
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