A smartphone is probably more advanced/complicated than a spaceship, technologically speaking.
As for reliability of computers, think of the string-and-bubblegum legacy mess that is Windows. It's essentially the lowest comparison point for computer reliability. I can't even remember when my laptop last crashed. These days you can easily run one for months without rebooting.
Computers are VERY reliable now, and could easily be made more reliable if there was an actual need for it.
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