Chasing "Five Nines", 99.999%, of uptime? It flags ultimate reliability. But it’s a feature most don't require. The gap between 99.9% and 99.999% is about 8 hours downtime per year. The infrastructure needed to close that gap is huge. Redundant cloud gateways in distant regions."Hot" failover sites using massive resources. And they sit about 99% idle. Operational excellence is matching tech to the mission. For healthcare, 99.999% is baseline. For construction, spend on security or network speed.