I always assumed that's what you were supposed to do anyway. If it's just slightly downvoted it is still somewhat readable but after that it gets hard to read quick. I don't think this has much to do with eyesight, it's by design. I guess poor eyesight might make it hard to distinguish between normal and slightly downvoted comments, but that's not too important a distinction anyway.

Yup. This is my precise annoyance with the styling. I understand not everyone will bother to read greyed out comments because they trust the wisdom of the crowd here. I do not. As a result, reading the comments adds one extra step now just to interact and engage.

Thankfully someone below our published some userstyles below.

That's interesting never thought about the accessibility problem with greyed out posts.