[thombat]

Anything launched is assembled from parts that have been certified as fit for purpose, voluminous paperwork showing the examinations, testing, etc, all to try to minimise the risk of failure. Once it has been in orbit for years or decades, facing ten thermal cycles per day, bathed in elevated radiation and ions, and pitted with micrometeorites, you'd really want a thorough examination before reuse (X-ray ultrasound, etc: not yet available off-world)