Modern windowing systems are also very similar. A Windows 3.1 or early MacOS user would have no trouble using a computer today.
Touch and phone interfaces will get there, too, as both software and culture evolve together.
I can't wait for, and would love to support, the Debian of phone architectures. In past HN threads, it has been suggested to me that the real blocker for a good open phone OS is at the hardware/kernel level. That was the state of the hardware environment in the late nineties and early 2000s.
Give it time, effort, and support, and a great and open OS will emerge.