> "There's a recurring pattern on HN where any time someone talks about knocking dozens of personal projects off their list"

Nobody was talking about that very believable use case. What they specifically said was "enterprise scale projects". Enterprise scale means lots of users, decades of backwards compatibility, regulation compliance, logging and auditing, reporting, role based access control and permissions, integration with other enterprise systems, etc. etc.

> "you AI doomers show up and demand receipts as though that's a total reasonable and"

Asking what large scale programs they have built is not "dooming". It's also not demanding. It's also not unreasonable.

> "definitely not obnoxious request".

Saying that it's "unreasonable and obnoxious" to ask people to justify their claims is where the likes of Theranos and Nikola electric truck company are hiding. If they don't want to talk about their stuff, they could have not commented. Since they commented it's reasonable to ask them about what they said.