Yeah, I agree with the OP here. After all this time, being able to change the chat colors at this point has some real We-reached-the-bottom-of-the-backlog energy, and they're just now implementing the ideas that weren't considered important enough before by the PMs to consider.

It hardly feels like a next generation release.

As a related anecdote (not saying that this is industry standard, just pointing out my own experience), the startup I work for launched their app four years ago, and, for all four of those years, we've had "Implement a Dark Mode design" sitting at the bottom of our own backlog. Higher priority feature requests are always pre-empting it.