Exactly. Had they done all the proper testing, they would have likely discovered all these issues, it's not a stretch to think that the management that allowed

Exactly. Had they done all the proper testing, they would have likely discovered all these issues, it's not a stretch to think that the management that allowed the project to get to the state it was in would have also pushed forward with the go-live despite the bugs that were discovered in testing. And just because they allocated time to testing doesn't mean they would have allocated sufficient time to remediation and re-testing. I've seen it happen where bugs were found late stage in a big-bang style migration, they were remediated, but there wasn't enough time left to conduct another massive mock go-live to make sure it worked. So you hope and pray...