Nice reading. I agree with most of your points. Specially:
Terrain setups, beneficial terrain, etc are all thrown out the window with Cursed spreading wildly and turning the entire map into a hazard.
I spent many time trying to prepare the terrain for one battle. It was a waste of time & effort. I almost cry when the enemy casted cursed terrain and destroyed all my surfaces so easily.
AI know what their LoS will be with any movement, allowing them to pull off frustratingly insane shots; whereas a player trying to line up the perfect shot over cover/height cannot.
This is even more infuriating. Ranged enemies are able of doing "imposible" shoots. Sometimes it seems like their arrows can even go through the floor and other solid objects.
There is no way to convert the large breadth of items into a sensible amount of more universal crafting materials like many other systems.
Useful ingredients are expensive and/or difficult to find. Even trying to find A SIMPLE EMPTY BOTTLE requires A LOT of time exploring the map. It's really frustrating to see you have spent a lot of hours in the game, you have tons of 'crafting' materials cluttering your inventory, but still you are not capable of crafting 2 or 3 relevant items.
Food is pointless.
The percentile healing is laughably small, but the temporary effects of food last for such little time that they can be half over by the time you start talking to someone.
To me, there is little to none sense of reward from cooking. The benefits from eating dishes are too small, considering the difficulty involved in obtaining those ingredients.
Sorry for my english.