It might have a sound technical reason to provide
error-correcting RAM,
but only Philips would ignore the financial consequences of having to
provide an extra 30% of memory for that functionality.
I beelive soem VAXen also had ECC (SECDED) RAM. And doubtless other
machines (Zilog S8000s?)
There are plenty of cases where it's worth spending more at the start to
have soemthing that works reliably, even if the PC seems to have
eliminated that idea.
-tony