Armeggedon is priority #1 for the same reason it was in the 1st cent.
getting people to do stupid stuff they would never dream of doing if they believed the world had thousands if not millions of years left in it
like avoiding marriage [1 cor 7:9] or avoiding college in this doomed system of things [jws]
Field service #2
why? because idle time allows people to think and thinking is of the devil.
Just as Nazi solidiers were made to endlessly march goose stepping for no valid reason...the more blindly you get people to act for you, the more they simply have to trust you...feeling stupid is not an option for most people, so they will defend their stupid actions rather than admit they were stupid.
To prove this point, just about every baptized JW knows at least one, may be two meeting attenders who are holding back because of field service, so if it was just about numbers, JWs could double over night if they dropped it...but its not about numbers its about loyalty, devoution and weeding out those who cannot be hypnotized.
Guilt#3
WT always presents an idealized Uber JW in all its writings as the gold standard, the perfect forgiven declared righteous completely anal, has no life of his own, does nothing but go out in field service and sleeps [usually in his cheaply purchased 4 door car so he can transport other JWs, car]... if he works, its part time, so he can gain money to pay for his gas and food so he can not be a burden on others in his field service group...but he preaches to all his co workers so that he never misses an opportunity to count time. He never watches R rated movies and does not even own a TV set.... he never goes to any parties unless they are watchtower study parties...etc.
of course all JWs feel sadly and grossly inadequate by comparison to uber JW and that is as it is meant to be.