I didn't think staying in the same code branch of 9.6 (from 3 to 4) would be an "upgrade" but I get what you are saying. I think my experience is getting burnt by people/past admins just leaving Interim releases and never going to the next MR/FR. Jus...

But 9.6(4) is available so why not use it? As per 9.6(3)20 RN:   "Important:  These images were not fully regression tested.  Each individual fix was unit tested, and the image has had a limited amount of automated regression testing to confirm a bas...