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There are general issues with having just a few large and complex 5250 application sessions:

The size and complexity may make the navigation model hard to understand.
It is hard for multiple developers to work on the same 5250 application session simultaneously because their individual work needs to be merged.
The 5250 application session takes longer to load from the server and longer to initialize.
Working out navigation paths at execution time takes longer because of the size of the navigation tree.