Bosu_san

Then what's the point of Rudeus and his daughter using it.

Yeah sword is side weapon like handgun in today, it's comfortable to carry every where in public and every day life, unless you are guard everyone will look at you weirdly if you carry spear everywhere, and sword is cool so noble love it and mostly kill each other with it.

Her parents even learn to speak to talk with her.

Just because you're strong doesn't mean you are good teachers.

Aisha has the best natural talent Author saying that she has potential to be the best at everything she do, in original timeline she's famous magician in the Court, who summoning people from another world as a hero too save the world or something.

Yeah!!!

I remember Eris train to hard that she doesn't pregnant because all embryo die from her intent training.

Well Laplace is good guys before spit in two and become insane, so we don't know what happened it might be Hitogami doing.

Originally Laplace is far from evil, he's half Demon half Dragon, and Orsted father previous dragon God adopted him as a son, so in a way he's Orsted uncle, after all world being destroy and only human world left, he tried to prepare some mana battery to help Orsted in the future but because of some unknown reason he spit into 2 being at some point like piccolo, and forget about himself and become evil. So it's likely Hitogami doing.

It's like how exercise works, you damage your muscles and it heal and growing to adapt to more pressure.