Let me put it this way. Imagine we live on civilisation where everything we doing our current day life, is automatic. Even the need of searching a drink would be automatic. All thanks to advanced machines that operate with unlimited energie and doesnt need mantenience. Those machines were made by orther machines, and subsecuent those machines were made made by orthers. Yes long time ago humans would have being being the first automatons, but need of fabricate them and how to operate them or fix them would be long forgotten. Whats the point of teaching or knowing how to fix something that would never breaks and has unlimited energie? Even if some machines breaks, orthers would fix them

The allagans were a culture were they had no back ups, no plan B on case the automatons fail beacuse they thought it was not necesary. That was their doom.
When everything falled, the survivors had no idea how to fix or operate the remaining machines.