Amazing - thank you for sharing that, it's very interesting to see the data collected together like that. I'm definitely going to take a bit more time to read through the detail - some things you can expect an automated tool not to pick up due to the nuance, but very interesting to see even things like contrast ratio being missed in such a large proportion of audit tools!
I totally agree, an automated checker should be used only as a kind of "initial check" to filter out any obvious issues before the code gets as far as code review or test. These tools can easily miss things, especially when the real test is the overall experience, not a box checking exercise. And there are some things I don't think an automated tool could ever assess in place of a human, e.g. whether or not alternative text is actually conveying what it should in the given situation.
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