Imagine not being able to use those keys when trying to type anything online. That would be impossible... Oh wait. But it all in all seriousness, they are very useful keys

For an example other than text, a lot of games use WASD to move

I think they meant the fnaf code cd+

Context for those who don't know (skill issue); CD+ is a combination of keys you can use in FNAF 1 and 2 to skip nights entirely