Why not? Early computers were built to last, some still are but competitive pressure means 'commodity' machines seem to be lucky to last more than twice their (UK) legal one year warranty period. My (1962) 1301 can even still read the magnetic tapes which were last written in the 1970s and the drums still had the bootstrap program on the write protected bands (of similar age) once we had got the timing logic adjusted back to specification. When designing something as revolutionary as RAMAC, they would over engineer and only in later designs start paring things down. A few revolutionary designs do of course have weak points and they either don't make it past prototype stage or the market soon finds the weakness and stops buying them.