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When do you actually need a bypass pipe?

Specifically I'm looking at two of the example files
IceStorage-Series-ChillerUpstream.idf
5ZoneDetailedIceStorageSimpleCtrl.idf
which do and do not use a bypass pipe on the plant side of the loop, respectively.

IceStorage-Series-ChillerUpstream.idf is connected as
pump -> chiller -> ice tank

5ZoneDetailedIceStorageSimpleCtrl.idf is connected as
pump -> splitter -> chiller and bypass pipe -> mixer -> ice tank

Intuitively I understand what the bypass pipe does, use the extra flow supplied by the pump that the other components in the splitter mixer do not use, but do you always need the bypass pipe? And how do you know when?

When do you actually need a bypass pipe?

Specifically I'm looking at two of the example files
IceStorage-Series-ChillerUpstream.idf
5ZoneDetailedIceStorageSimpleCtrl.idf
which do and do not use a bypass pipe on the plant side of the loop, respectively.

IceStorage-Series-ChillerUpstream.idf is connected as
pump -> chiller -> ice tank

5ZoneDetailedIceStorageSimpleCtrl.idf is connected as
pump -> splitter -> chiller and bypass pipe -> mixer -> ice tank

Intuitively I understand what the bypass pipe does, use the extra flow supplied by the pump that the other components in the splitter mixer do not use, but do you always need the bypass pipe? And how do you know when?

When do you actually need a bypass pipe?

Specifically I'm looking at two of the example files
IceStorage-Series-ChillerUpstream.idf
5ZoneDetailedIceStorageSimpleCtrl.idf
which do and do not use a bypass pipe on the plant side of the loop, respectively.

IceStorage-Series-ChillerUpstream.idf is connected as
pump -> chiller -> ice tank

5ZoneDetailedIceStorageSimpleCtrl.idf is connected as
pump -> splitter -> chiller and bypass pipe -> mixer -> ice tank

Intuitively I understand what the bypass pipe does, use the extra flow supplied by the pump that the other components in the splitter mixer do not use, but do you always need the bypass pipe? And how do you know when?