I actually think that there might be something to it. The current keyboards already have a small key travel. A solid-state keyboard with “taptic” feedback from individual keys could feel ok.
The current haptic feedback on the touchpad works fine because all you need to know is that you pressed the touchpad, not where you pressed it.
That's no longer true once you have a range of keys that you are pressing. You need to ensure your fingers are properly aligned so that you press the key you intend before you press it. Without some actual structure, you don't get that feedback.
They did the same thing with the iPhone 7. They removed the physical home button and simulated feedback with vibration. Then they got rid of the home button for the iPhone X.
That's no longer true once you have a range of keys that you are pressing. You need to ensure your fingers are properly aligned so that you press the key you intend before you press it. Without some actual structure, you don't get that feedback.