This thread makes it sound like it's impossible to make a medium scale application work without FKs constrains. I work on a commercial application that depends on relational relationships without FKs and the number of data corruption cases that we run into on regular basis is zero. Data integrity is handled at the application side, unexpected crashes are accounted for by heavy use of transactions, and everything works just fine.

To be clear, I'm not advocating against the use of foreign keys. But not using them is perfectly doable and not at all what this thread would have you believe.