Integration problems rarely announce themselves as outages. More often, they show up as a person on your team manually copying data between two systems every morning, because the integration that was supposed to keep them in sync either was never built, or broke quietly months ago and nobody noticed because the workaround absorbed the pain.
That manual reconciliation work is expensive in a way that doesn't show up on any invoice — it's hours of skilled staff time spent on data entry instead of the work they were hired for, and it's a standing source of errors, since manual copying is where discrepancies between systems actually originate.
The businesses that avoid this treat integrations as a first-class part of system design, not an afterthought bolted on once two tools are already in production. A well-designed API layer between systems is what turns "we have five systems" into "we have one coherent set of operations," rather than five separate sources of truth that drift apart over time.
If you're not sure whether this is already costing you, the tell is simple: ask how many spreadsheets exist purely to move data from one system to another. Every one of them is a manual integration your systems should be doing automatically.
