Agreed, there are constant "loving reminders" about not slowing down in your service, but the reasons generally presented that someone might slow down are given as materialism, laziness, "lack of appreciation", overconcern with your own health, etc.
I don't ever recall them offering counsel against "fading as a strategy to avoiding shunning when you realize that you no longer want to live the JW lifestyle", i.e., as a conscious choice. Not "drifitng", but purposely deciding "OK, here is my plan: start missing one meeting per month, then later missing one meeting per week, then...etc."
But as I noted in my first post, it is becoming a more-common method, and in many cases it works. So why don't they acknowlege that?