Addressing your OP question:
How many other doctrines,that we were ordered to preach by the WBT$,no longer exsist?...OUTLAW
1. Pinatas were bad. Now generally OK unless you see demons fly out when you whack it.
2. Wind chimes used to keep demons away. (And that....................was a bad thing? WTF?) But now that they don't keep demons away they're..................... good?.........., or at least OK if you really want one.
3. College: I think the GB is playing with a dimmer switch on this particular "light". Not exactly off, on, off again. More of an almost completely dark, then somewhat light, now just kind of a romantic "mood" lighting. Until the 1990s, college was virtual apostasy unless you were lucky enough to have one mean "unbelieving" parent who made you go. (Poor kids ) Then it was almost a green light, and now it's almost back to a red light (but not quite, depending on the local BOE and how thick your skin is).
4. Gum chewing. Used to be pretty much, use your common sense and good manners, assuming you had some. Now it has been specifically forbidden at "large outdoor conventions". (Yes, in writing, in the Watchtower). No specific talmudic rule was laid down about any other "Christian" meeting. (Why, I don't know.) It's been fun watching the local tempest in a teapot over this life-and-death issue that all true Christians must face.
Well, that's all I can think of for now.
Open Mind