Can someone introduce threat model of this feature? and what Duress Pin and Password should I set? What about my_current_password_delete? It's very hard to remember another password for duress except my current password for lockscreen.

When you are threatened to tell your password, you tell them the duress password. This could be anyone.

My intrusive thoughts on typing the duress password myself is kinda strong 💀

Depends on the threat and data to protect. E.g. if I'm held at gunpoint and all I can lose is a bit of money, I'm probably not giving a duress pin. But if I'm a journalist protecting my sources and family, I would.

A more practical approach for me is to put in my birthday as duress pin. So if some bad actor or the police takes my phone and tries to guess the pin, they'd rather enter the duress pin than the real one.