It’s at its core a case by case decision, I think FK are also a net negative in data ingestion scenari where the data set is big enough.

Trying to make sure everything is where it needs to be at any given time, everything is inserted in the right order and the data is always consistent brings exponential amount of conplexity when it could all be checked at the end and pruned for invalid data. And usually DB integrity will not be enough, you’ll want business level validation that all is OK, so there will be app level checks anyway.