The go-bag thing was a direct result of the Hurricane Katrina event in the us in 2005. Thousands of JWs were caught up in the mass evacuations out of Louisiana into nearby states, and elders lost track of many of them due to not having up to date contact info. Plus, without having time to take any supplies with them, JWs were forced to rely on "worldly" charities to survive.
This situation was absolutely horrifying to the Bethel bigwigs.
Not so much due to concern about the welfare of the affected JWs. Rather, it was the loss of control. If a New Orleans JW was relocated to Texas, what meetings would he attend? How would the elders spy on, er, shepherd, them? What if a relocated JW discovers "hey, these 'worldly charities' are not foaming-at-the-mouth devil worshippers"? What if he needs to go to a hospital - how would the local HLC be there to enforce the blood prohibition? What if a few dozen, or a few hundred, fence-sitting JWs used this an opportunity to "fade" from the organization?
Terrifying for Bethel to lose so much control.
So, since 2006 or so, "disaster preparedness" is now part of the WT platform. Each congregation must have a "disaster plan". Each publisher must supply contact information to the elders and update it if anything changes. "Go bags" to reduce dependency on "worldly" institutions are now strongly encouraged. Videos on hurricanes, floods, earthquakes, etc. affecting JWs are now part of the regular rotation. There are meeting parts, at least annually, reminding everyone of all of this.
Of course, being prepared for disasters is a good thing.
The issue is the motivation for pushing it. WT's track record over many many many decades is utter disdain, even contempt, for the rank & file. So now suddenly they want everyone to "be prepared"?
Why? Which reason fits better: They suddenly have become altruistic and are solely concerned about the welfare of their adherents, OR they haven't changed one iota and are primarily concerned that lots of JWs could "slip through their fingers"?