Riiiiiiight. Right! Those QA testers were kept in pods, had no friends or interactions outside of their jobs, and ZERO motivation to espouse accessibility standards to me outside of those professional boundaries.

None of them were color blind or hearing impaired. All perfect humans just like everyone else. No stories or personal anecdotes to make an impact. So few good examples. Sigh.

We never, ever, ever went out as a group with the designers or anyone from any other walk of life, never talked about our siloed skillsets, never met each other's friends or spouses.

Not once did we have a discussion about the selection bias you referenced.

Fucking /s if it's not obvious, and I suggest getting to know your peers better versus your rather peculiar brand of solipsism