It all depends on what you understand by 'integration'.
Complete integration is a potential nightmare.
I've seen it attempted three times. Two of the implementations were so-so, the third got into very deep water, overrunning its time and cost targets by several hundred percent. I am not a fan of fully integrated systems because of the project risk exposure. Reusing or recycling quality management procedures does not count as integration, in my view. Suitability' does not mean certified, although that helps.