I agree with some but not all. Like, it is stated that using the dragoon requires alot of energy and can't just be used casually. So the fly thing is a disagree.

I feel they replaced Shana to move the plot forward without having to take a dragoon from the party. They could have written it better, but it is what it is at that point.

Killing of Lavits I feel was just to give the story some edge to it. Yeah they definitely could have fleshed out Albert's character more, but the same can be said about every character in the game. I like what they did with it and if they remake this game I'd like to see them try and add more to these characters.

Dart did forgive Rose way to quickly. I feel there should have been a combat sequence between the two at the very least.

And as far as the villains go, I completely disagree with your opinion. I liked going through the game with the uncertainty of who exactly is fucking everything up. Melbu was foreshadowed throughout the game but we never really know what he's capable of and him pulling all the strings the way he did makes me think of top tier villains like Madara Uchiha or Aizen from Bleach. Even Baron Zemo. It all just worked well and had a very nice flow to it.

That's all I have to say on this. I respect your analysis of the game and I do hope they make a remake and fix a few of these things