Gaming

You’re saying some people shouldn’t get to play a game where difficulty options are an easy solution.

They can play it (assuming they have the money to buy the software and hardware, but that's a whole other accessibility problem). There's no guarantee they'll be able to 100% it. I don't think it's axiomatic that everyone should be able to 100% every game.

You're right that it doesn't really matter in single player games. I did once have an argument on this topic where the other person said they should be able to change the rules in multiplayer to suit their desires. They wanted more forgiving dodge windows, just for them, unilaterally. That can fuck off.

A book or a movie isn’t an equivalent comparison.

Why not?

Not too mention there ARE simplified versions of popular books or abridged versions and movie guides and so on anyway.

There are let's plays and wikis for games.

No one is asking for the subject matter to be dumbed down, or for the story to be shallow or transparent.

In some cases, they are. It's cliché now, but part of the story of dark souls is often cited repeatedly struggling against an uncaring, dying, world until you persevere. If you rip that out and make all the creatures docile, I don't know if I would call it "dumbed down" but it would certainly be a substantial change. Sometimes the medium is the message. But, often, you are correct that it is not really the case.

Why should someone not get to play through a game because they insisted their hand and can’t dodge anymore?

No one's arguing against accessibility for controls. I'm not even against well done difficulty options. (The Bethesda style "we just give the enemies more health and damage" is a poorly done difficulty slider, in my view). I just think "I cannot hear so I need subtitles" and "I just want to win on the first try" don't belong together.

Though, introspecting a little, I think what's going on is maybe ableism or something like it. I don't actually believe some of the people who say "this game is too hard. I want an easy mode" are disabled. I read them as just half-assing it. Like someone who wants to play pro soccer but doesn't want to actually get in shape so run, so they want a smaller field. And, as you say, it doesn't really matter what someone does in a single player game on their own time, but for some reason it irritates me when someone's like "I'm just as disabled as that blind guy" when they're perfectly capable, they just haven't practiced. Something about "I've spent an hour on this task and I haven't mastered it, I'm disabled" sits wrong with me.