It's like if you went to church, and the vicar said:
"You know what? I don't fancy delivering this sermon with moral guidance. Lets just sing 10 hymns in a row."
I grew up JW, and their meetings were very structured and organized. They do sometimes show videos and such, but a congregation is organized around not one pastor or anything but a whole group of them, any of who could do the main Sunday surmon (and I have seen subs often enough). They also have "ministerial servants" who are I guess basically elders(pastors I guess?) in training, and they often handled a lot of stuff too.
That makes sense. This church was 'non-denominational', which meant that if they could just have the church band play a jam session and still make money, they would.