You can change the difficulty, it's just not spoon-fed to you with a single button. Their games are RPGs, if they're too hard then level your character and upgrade your weapons. There's also a myriad of items and spells you can use to buff/assist you through challenges, and if that's still not enough you can use wikis to find what attack types enemies are weak to or strategies/cheeses other people used.

And if all of that is still not enough, you can use mods to make the games easier.