There is no point to add MRT. We have defender definitions a couple times per day, so there is no point to add definitions, too. As I wrote before, these are "Windows 10 Updates". And You can hide these updates. The goal of this Update Pack 4 Online is, I do not want to force people to anything, even if these "Windows 10 Updates" are already included in CU. This can consider, in some way, stupid, because "W10 updates" are (mostly, I think) inside CU. I do not to want force people to restart, too, even if they have to restart, to make WU to work. It is Your computer, not mine.