I think the point here is that there is no such thing as a stable state in software. Maintaining old infrastructure to support old applications is not a steady

I think the point here is that there is no such thing as a stable state in software. Maintaining old infrastructure to support old applications is not a steady-state, it is a degrading state. As bugs and exploits are discovered and patched in new versions of windows/browsers/databases/frameworks/libraries/etc the old systems degrade to a vulnerable, un-maintainable, unsupported and often un-upgradeable state.