Delphi Cookbook - Third Edition

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Using publish/subscribe or message bus architecture prevents all the potential problems highlighted above from becoming drawbacks. It is a very good way of implementing effective communication between components in an application without any of them needing to be aware of the others immediately, with all the benefits this entails. In the end, Event Bus saves loads of time and makes your code more readable, maintainable, extensible, and flexible.

"If the only tool you have is a hammer, you tend to see every problem as a nail."

- Abraham Maslow

When developers discover the benefits of it, they tend to replace everything with Event Bus, every communication call! Abusing it makes your code hard to understand, and hard to debug. ...