Maybe you lack confidence because you keep looking for things to shoot down instead of opportunities for good things to happen. But, what do I know? I'm just a passive observer.

I lack confidence because i dont feel like he understood the problem. A stronger acknowledgement would've given me more confidence such as:

"I understand this character I created has no personality whatsoever. I will make it clear what kind of person she is"

"I see that I'm talking about war but not establishing the country they live in. I will expand on that."

Or

"I understand that I need to stop making Regalia a mystery. I will expand it"
 

Let's see what happens and try to get Tara to finish a project instead of having you two shaming it to death and then continuing to beat it. Once that is allowed to happen, maybe, just maybe, the creative process of editing will be more helpful. After all, some people just suck at starting things. That's life.

Some people do suck at starting things. But starting bad doesn't create a good foundation. Keyword "Bad" not "Rocky". Its ok to start off rocky every now and then but the flaws i see here will carry to the end. In my experience i noticed when people do write a story and just continue the holes and logic continue, they don't go away, they get worst and once they finish and these issues get pointed out, the reset button has to be pressed. So at this point. Why give criticism at all if well wait for the finish product. The first chapter is the most important chapter. 

When people tell me the flaws in my first chapters I truly try to see where they are coming from. Even if I don't fully agree so long as I understand where they are coming from, I can modify it just a hit so that they can get the picture. Sometimes when no one tells me anything if i just have 5% doubt i didnt make it cear i will review it again.

I had advised multiple times in multiple stories "don't press the reset button". Take the criticism, understand it, and make adjustments and expand.

There are issues with the fundamental parts that make this story. Such as the idea of a dress made of blades and having to be both dancing and  warrior. But lack of creativity. I however noticed when Tara writes a particular character he will unconsciously make them Mary sue. And it's usually the "diverse" character. So even though Tara hasn't mentioned it here, based on patterns from before I KNOW Katherine is a character based on diversity (that and praise dancing and other elements to her character give that away).

It's important to understand what makes good character development. Just being able to wear the armor is one thing. Because you need to understand what a first chapter should have. Comics and manga are much easier.