I think you may be misreading the core distinction being made. The endurist-serenist framework isn’t about where to draw a line between acceptable and unacceptable suffering. It’s about a more fundamental question: should such a line exist at all?
An endurist believes that no line should exist—that life must be preserved regardless of suffering intensity when death is the only alternative. This isn’t about stubbed toes or caught fingers—it’s about whether there exists ANY level of suffering, no matter how extreme, that would justify choosing death when that’s the only alternative.
The Catholic Church provides a clear example of pure endurism—they maintain that suicide is never permissible, no matter how extreme or hopeless the suffering. This isn’t about finding an acceptable threshold—it’s about rejecting the very concept of a threshold.
So when you ask about where to draw the line, you’re already operating from serenist assumptions. The core philosophical divide is about whether such a line should exist at all.
For compliance with state rules (e.g., paying taxes), the BATNA is state-imposed violence (imprisonment), and it’s artificially created by the state. In this context, I’m not sure how productive the BATNA framework is in shedding more light on the situation.