The DOB field is different from name and address because it is a fixed attribute that never changes. Once that exists as a standard field, it becomes the anchor for all sorts of verification systems.
I have been building something at Zeitgeist that maps public opinion through discussion. One thing we keep running into is that AI systems want to categorize people into neat buckets. They will say "users under 18" vs "over 18" and move on. But real human disagreement does not work that way. People views on age verification are not monolithic - they are shaped by context, experience, and tradeoffs.
We are seeing this play out everywhere now. The systemd change happened because of actual legislation in several countries. It is not theoretical anymore. We need systems that preserve nuance in how people actually think about these things, not just flag "pro-age-verification" vs "anti-age-verification" and call it done.