This is neat in theory, but unworkable in practice.

The hard line trigger almost always happens in a wider context. You often want the wider context, but it's impossible to fully define. Let's try a few examples from the article:

"Hard line: Annual raise is 0%" -> What if it comes with a much larger stock grant? Or additional paid time off? Or something else you value? Will you really just mechanistically quit?

"Hard line: A friend doesn’t repay an $X loan" -> really? What if, say, they lost their job? You want to make friendship contingent on your friends employed. There's a reason there's an adage saying "Don't loan money to a friend, you might need to decide whom you like more".

"Hard line: A government blatantly violates a constitutional amendment" -> Not even waiting for a court decision? What if it's Abraham Lincoln suspending Habeas Corpus? Or Wilson enforcing the espionage act, if that's more your political leaning? What if the government first repeals the amendment - will you be pro-slavery if it's made legal?

The world isn't a series of if-then statements. Even a hard line requires more than a single condition - at best, that condition reminds you to re-evaluate where you are.