With the exception of debuff stacking, I thought everything else is rather intuitive.
I have to say that the game is not very forgiving when you did not plan your soul tree properly or understand the mechanic/himes ability early. I went Arthur first because I thought I needed help in damage dealing because I deal abysmal damage, only to find out that healing hime that is not Sol/Amaterasu is not going to cut it even if you run two of them. Then after getting both Arthur and Andromeda, I found out that I needed some debuff ability too like Modred's black propaganda to control rage bar or D'Artagnan's ability to atk/def debuff everything as not all team have physical atk/def debuff.
Although with that said, it is difficult to plan ahead that well because the team you are going to build is generally going to be determined by how lucky you are with gacha.
I'd say that small wall of text you typed some time ago to answer my questions about debuffs could be a starting point...