So, Wish?

Mom, can I have Fix This? No, we have Fix this at home.

Fix this at home: Fix boat

Points at BBEG : Fix this.
BBEG's mom walks in.

Unknowing warlock whose sworn god just makes it happen

A wizard archetype that lets you sacrifice known spells for more slots would be sweet

Pointing at society: Fix this.

Points at army: “Fix this!”
Army regresses into infant-hood and is rendered incapable of battle.

Points at own army: “Fix this!”
Army is buffed.

How many times is this just a neuter/spay magic?

This is actually a thing in JoJo's Bizarre Adventure (Crazy Diamond). It's fun to see how they can make up cool scenarios with it:

Feats of this nature include trapping an enemy by restoring pieces of a broken crate around him; exposing a Stand formerly bound to an object; and tracking by restoring a severed hand, forcing it to seek out and reattach itself to the body from which it was cut off.

https://jojowiki.com/Crazy_Diamond

I just realised that this is basically the plot of Redo Of Healer.

Sound more like a cleric kind of thing.

This is a little like Mashle except instead of a spell the main character just uses fist to fix every problem

Childhood trauma of npc or other player? Fix this!