It's up to the developers, of course, but there is no real reason not to give players options whenever possible in single-player games. Options hurt no-one but they do allow those who might not have been able to to handle a game the chance to play it. Yeah, I know gamers are known for their childish "get gud" bullshit but those kinds of people shouldn't be allowed to define the entire medium. If their ego needs validation from videogames then they're not really worth worrying about to begin with.
There is just no good reason to exclude people. Especially when you look at it from an economic perspective. Series like Elder Scrolls have a ton of female gamers, older gamers, and "casual" gamers who just want an enjoyable experience. Easier modes let them join in the fun without any loss to those who want more difficulty.