I think I can answer your first part about the girls helping during the choices. I think there’s a gameplay reason and a lore reason.
For the gameplay reason it would just make things a little complicated way more than it needs to be during a previous comment chainsaw showed his network of the questions and to be honest it’s quite complicated. If you add special interactions, it would make it way more complicated than he needs it to be how he has it is quite simple.
Now the lore reason why the girls don’t help him get to the other legendarys because it’s mostly the MC doesn’t want them to risk themselves. They are legendarys yes and they are all powerful, but they are still pregnant and he does not want to take any risks to the eggs and to his girls.
And about the other suggestions, you gave chainsaw that’s up to him. He can answer you in his own way.