Two useful applications can still produce a poor operating system if information has to be copied between them by people. The cost appears as duplicated capture, spreadsheet reconciliation, status checking and delayed handoffs.
Integration cost is often labour cost in disguise
When systems disagree, somebody becomes the bridge. That role may not appear in the technology budget, but it consumes operating capacity and creates opportunities for error.
Define ownership before connecting systems
Integration works better when the business knows which platform owns each important record, what event should move information, and what happens when the transfer fails.
Not every connection must be real time
The right design depends on the business consequence of delay. Some data needs immediate propagation; other information can move safely in controlled batches. Architecture should follow the operating need rather than technical novelty.
What better looks like
Information is captured once where practical, authoritative ownership is clear, failures are visible, and staff spend less time reconciling software with software.