Not only you need major mistakes by multiple people and systems for two planes to touch while taxing, but two planes colliding even in an apparently minor way is enough to ground the planes for controls.
There is absolutely nothing minor or common about a collision of airliners on a runway at a major airport.
Similar mistakes have resulted in serious incidents. There will be a full investigation of this.
If it's just a wingtip Boeing sends a AOG (Airplane On Ground) team to repair it onsite. They remove the wing skin replace any ribs, spars, wiring, lighting, etc, that are damaged, before riveting a new skin over it.