[Terr_]

That "we" is suspicious, I suspect it doesn't adequately cover the whole civilization in question.

Sure, me and my neighbors waiting for the train don't need to build a sundial, we can tell the time "without thinking" by glancing at our ticking pocketwatches... but other people spent absolutely enormous amounts of brainpower thinking about meshing gear, friction in bearings, metal alloys that don't distort too much with temperature changes, and how to make accurate tiny screws, and...