For MSPs supporting industrial clients, business leaders responsible for operational risk and OT engineers implementing the standard, IEC 62443 is ultimately about securing OT and ICS environments without undermining availability or safety. Unplanned downtime, legacy systems that cannot be patched, air-gapped facilities with limited or no local IT support, and the need for predictable recovery are the day-to-day realities behind requests to demonstrate IEC 62443 alignment.