The last JW gathering I went to was my Dad's funeral a couple of months ago. There were a few people slipping in scriptural advice. But for the occasion, I can see that.
Before that, the last JW gatherings I was at were in the late 80's. They didn't talk about spiritual things. My dad was an elder and used to give talks all over the southeastern end of the state. We got invited to lunch so many times. Very little of the talk was about spiritual things aside from the before-meal prayer. They'd talk about different JWs, work, the news, etc.
Service groups were different. A lot of times there would be spiritual talk. Which is more natural. They encounter people at the door and get back to the car group and discuss retorts they should have made. Or they discuss how to present magazines. The whole thing isn't social. But back at the coffee shop, not so much spiritual talk, unless somebody had some experience to share.
But avoiding spiritual talk doesn't seem new. I think a lot of JWs have thier spiritual life and they go to the Hall for that. And when they're in company, they talk about other things.
After all, what's there to talk about? It's the same stuff over and over again. You can't strike up a discussion with opposing viewpoints because everybody's supposed to have the same opinion. All you get is things like "What a great talk!" followed by "yes it was" all around or comments about the speaker's style. Oooh! Such inspiring conversation! Since you have to all express the same opinion of doctrine, what other spiritual things are there to talk about? Rehash the teachings? Nobody wants to hear the basics over and over. Cover the more obscure teachings? Aside from being boring conversation, that's dangerous too. What if you have it wrong? You don't want to admit that you were daydreaming and missed that point. Better not to rehash things either. Talk about safe things, the weather, the construction on the highway, work, vacations, etc.