I don't think anyone thinks that casual content shouldn't exist in this game. I have friends who can barely handle things like omega normal as well and I'm glad they have things they can do on a daily basis. However I feel like the tougher content should be tougher to satisfy those who are looking for more of a challenge, especially when the majority of the content is geared toward the casual audience.

I also don't think the people who push for tanks and healers to contribute more expects someone with disabilities to be pumping out crazy dps or whatnot. I've run into multiple people who told us they had some kind of disability when they zoned in and we adapted with no questions asked and no complaints. However, you can't just expect people to assume everyone who isn't putting in visible effort has some kind of disability. There's probably far more people who just aren't willing to put in a bit more effort because they're too busy watching something on a second monitor than those with genuine disabilities preventing them from doing so. All we want to see is for people to give it a decent amount of effort, for those that you described in your post if the bare minimum is the best they can do and they're genuinely trying that's more than good enough for me.