Maybe it just works, has been PROVEN to work over a century, has known failure states, and "upgrades" would simply be a massive waste of time and money? I know

Maybe it just works, has been PROVEN to work over a century, has known failure states, and "upgrades" would simply be a massive waste of time and money? I know there is a huge obsession with new and shiny amongst programmers, but when it comes to massive real world infrastructure projects the last thing you want is unknown factors and "churn", especially when the benefits are unclear and dubious at best. Just because something is old, dosent mean it should be upgraded, infact if its worked well for as long as it has you should consider that very carefully first.