This is related to what we mean we we say 'legacy' systems, do we mean it's simply an old system inexplicably holding out in the modern world, or do we mean tha

This is related to what we mean we we say 'legacy' systems, do we mean it's simply an old system inexplicably holding out in the modern world, or do we mean that it's a tried and proven stable system that have continued to perfectly fulfil it's use case for 32 years?