Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1347#issuecomment-156104558
I limited the interface on purpose. I think for most purposes it should be
sufficient and having it in this limited form allows us to to incremental
checkpoints very easily. If we only allow adding elements and clearing the
whole state you immediately know, for example, what you have to checkpoint if
you do an incremental checkpoint. If we allow arbitrary modifications of the
list state we loose that or need to use work-arounds. (I think for that case
users would have to use a ValueState that contains a List, for example.)
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