Ask HN: Who's still keeping a DOS machine up because the business depends on it?

The article highlights how many organizations still rely on obsolete DOS-era and legacy industrial systems because they are deeply embedded in core operations and difficult to replace without risking downtime, certification delays, or business disruption. For CIOs and technology leaders, the strategic implication is clear: legacy IT is often a resilience and operational continuity issue, not just a modernization backlog, and unmanaged end-of-life systems can create security, staffing, and vendor-support risks that persist for years.