Is anyone using MCP notifications?

The MCP spec includes server-to-client notifications for things like list-changed events, progress, log messages, but I barely hear anyone talk about them, and I'm not sure how much they're used.

In theory, it would be nice to receive updates from MCP servers ("Your product has been shipped") like we are already receiving from apps installed on the devices.

I'm wondering if this is a useful part of the protocol or just something that will mostly be ignored/deprecated.