> You want to make sure users aren’t stressing about making some final un-revokable decision before they even use the app
It has never come across that way as an end user. As it has always been on some terrible change or option where the answer should be "no, now bugger off forever", I have viewed "not now" as the same as "ask me again later":
an explicit thumb in the eye and statement by the software developers that they think their mandate takes priority over my preferences and that I am not qualified to make decisions about the software I run.
It is a very easy way to maximize my disdain for a developer/team/org.