They deliberately switch around the placement of the homepage queues. The goal is to keep you engaging with the product and discovering new things. They don't want you holding a Netflix subscription just for Friends, or whatever.

But why? Isn't watching Friends a viable reason to own that subscription?

You're more likely to cancel when you're done watching that one show. They want to continuously give you a new reason to keep paying.

Their awful UI was one of the reasons I dropped the service. I wonder what fraction of former customers are like me.

They're hoping to hook you on something else so you'll keep your subscription after you get tired of watching Friends.