To be fair, developers didn't get any advance notice of the iPhone X. We find out about it when everybody else does, and even though there was a (really buggy) simulator, you can't really test it until you have a device in your hand.
The iPhone X has a substantially different interaction model, and there are quirks which could cause issues for some Apps and may take some time to resolve. For some apps, it may make your existing gestures awkward and more work may be needed to get it right.
At the same time, the iPhone X install base isn't that large. Obviously it's not ideal to not support the full screen size, but developers may have bigger issues which affect more of their users, with worse consequences, and are thus higher priority.
Don't worry, of course developers will support the iPhone X. Just try to understand that it may take some time to fit it in to existing roadmaps.
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The Apple Watch is just sad (and I'm a day-one owner, who still wears it every day). On iOS, Apple gave developers the tools to experiment and create creative interfaces which took advantage of the device's interaction model and hardware. For watchOS and tvOS, they did the opposite, and enforced a very rigid vision of how these Apps should be laid-out and interacted with. The result is sterile products which customers do not engage with, and which shuts out the creativity of developers.
iOS apps can look, feel and behave radically different from one another. That's fine; human beings can handle that. We learn to use individual tools, and develop preferences based on those differences. watchOS and tvOS apps are all basically the same.
