I know very few JW's who could have explained the original doctrine of "this generation" and explained how JW's arrive at 1914 as the start of the Last Days Times, time, and half a time and 2520 years from a year for a day and all that mumbo jumbo.
Do ya see that BS in an recent publications? Or, on JW(dot)Borg? NO! They simply state that 1914 was the beginning of the Gentile Times and of the prophesied Last Days. Yeah, dumbass, it's simply a matter of record.
JW's used to call at the doors with THREE scriptures and a 192-page book for a Bible Study.
Then 32-page brochures took over more-or-less (less cost to print).
Then 1 or 4 page tracts. (Remember the "Kingdom News" series?)
NOW JW's CARRY A BUSINESS CARD STATING GO TO JW(DOT)bORG. And thanks to Covid, they just mail it in the mail randomly and anonymously. (But evidently sometimes they draw pretty shit on the envelope.)