Why "Objects are only deleted on idle"?

[Richard Gaskin]

In the LC 8 Release Notes I see:

    Objects are only deleted on idle (8.0.0-dp-3)
    The engine will now flush any recently deleted objects after
    each command as long as they were created during the current
    event handling loop.
    If an object is created during one event handling loop, and
    then deleted during another nested event handling loop it
    won't be flushed until control returns to the original event
    handling loop.
    The upshot is that in tight loops, creating and deleting
    objects will result in objects being flushed immediately,
    reducing memory usage and making it easier to write object
    processing code which creates and deleted many objects

I'm having a hard time conceiving of a circumstance in which it's 
necessary o build a large number of objects only to delete them again in 
the same handler.

What am I missing?

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
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