It's funny you talk about how "normal people" speak when referring to the writing in this game. I don't know where you are from but I have never heard anyone say things like " 'Tis no ordinary woman who can face a primal and emerge the victor! " and "Mayhap a brief summary of the situation would help clarify your thoughts on the matter" or how about "And all not afield will aid the fight from afar"

The writing is used to make the events and things said seem more sophisticated and grand. Here, I can do it too if you really like:

"Please go to the store to get some milk"
can be turned into:
"If you are so willing, go henceforth to the store and procure me some milk"

Both say the exact same thing. Which one was easier to read and understand? Which one sounds more like how people actually speak? You think that just because a character uses long words that it is more adult?

As for the characters, if they are so memorable, give me some defining character traits of say, Minfillia or Yshtola or Alphinaud. For all the time we have "interacted" with them, we know hardly anything about them. I know more about Sylvie from the Conjurer storyline than any of the Scions, despite having done a fraction of the quests with her.