Why "Export as Python script" button is unaccessible in QGIS 3.0/3.1 Modeler by default?

In QGIS 3.0, "Processing Modeler" window has no "Export as Python script" button unlike QGIS 2.x.

If you look at the codes (in DlgModeler.ui and ModelerDialog.py files), you see the code lines related to that button.

in ModelerDialog.py (commented):

#self.mActionExportPython.triggered.connect(self.exportAsPython)
.
.
#self.mActionExportPython.setIcon(
#            QgsApplication.getThemeIcon('/mActionSaveAsPython.svg'))

in DlgModeler.ui:

  
    Export as Python script...
  
  
   Export as Python script
  

After some editings I explained here, "Export as Python script" button came into view.

Is there a specific reason or is it a mistake?

Answer

This was intentionally disabled by commit 4f2a464

[processing] remove obsolete code and disable exporting models as script until we update it so support new scripts format

@alexbruy alexbruy committed on 2 Feb

So re-enabling it yourself won't be of any use as the output code won't be usable in QGIS 3x.