List of Qt DLL's that I found unnecessary for my app - in case it helps anyone

unused_qt_file_remover.sh

# It can easily be different in your case, but should be a good starting point

rm -rf PySide2/qml
rm PySide2/QtNetwork.abi3.so
rm PySide2/QtQml.abi3.so
rm libQt5WebEngineCore.so.5
rm libQt53DAnimation.so.5
rm libQt53DCore.so.5
rm libQt53DInput.so.5
rm libQt53DQuick.so.5
rm libQt53DRender.so.5
rm libQt5Bluetooth.so.5
rm libQt5Charts.so.5
rm libQt5DataVisualization.so.5
rm libQt5EglFSDeviceIntegration.so.5
rm libQt5Location.so.5
rm libQt5Multimedia.so.5
rm libQt5Positioning.so.5
rm libQt5QmlModels.so.5
rm libQt5Quick3DRender.so.5
rm libQt5Quick3DRuntimeRender.so.5
rm libQt5Quick3D.so.5
rm libQt5QuickParticles.so.5
rm libQt5Quick.so.5
rm libQt5QuickTemplates2.so.5
rm libQt5RemoteObjects.so.5
rm libQt5Scxml.so.5
rm libQt5VirtualKeyboard.so.5
rm libQt5WaylandClient.so.5
rm libQt5WaylandCompositor.so.5
rm libQt5WebEngine.so.5
# rm libQt5XcbQpa.so.5  # !
rm libQt5XmlPatterns.so.5
rm libQt53DExtras.so.5
rm libQt53DLogic.so.5
rm libQt53DQuickAnimation.so.5
rm libQt53DQuickExtras.so.5
rm libQt53DQuickInput.so.5
rm libQt53DQuickRender.so.5
rm libQt53DQuickScene2D.so.5
rm libQt5Bodymovin.so.5
rm libQt5Concurrent.so.5
rm libQt5Gamepad.so.5
rm libQt5MultimediaQuick.so.5
rm libQt5Nfc.so.5
rm libQt5PositioningQuick.so.5
rm libQt5Purchasing.so.5
rm libQt5QmlWorkerScript.so.5
rm libQt5Quick3DAssetImport.so.5
rm libQt5Quick3DUtils.so.5
rm libQt5QuickControls2.so.5
rm libQt5QuickShapes.so.5
rm libQt5QuickTest.so.5
rm libQt5Sensors.so.5
rm libQt5Sql.so.5
rm libQt5Test.so.5
rm libQt5WebChannel.so.5
rm libQt5WebSockets.so.5
rm libQt5WebView.so.5