Why is treeview widget not supported by Photoshop only?

InDesign, Illustrator, and AfterEffects are supported, but only photoshop is not supported.

It seems that it became unsupported when moving from Flex to Mondo, but I would like to know the reason why such a difference is generated between software and the future correspondence.

PhotoshopCC2019

InDesignCC2019

//treewidget sample scripts.

var dialog = new Window("dialog");

    dialog.text = "Dialog";

    dialog.orientation = "column";

    dialog.alignChildren = ["center","top"];

    dialog.spacing = 10;

    dialog.margins = 16;

var panel1 = dialog.add("panel", undefined, undefined, {name: "panel1"});

    panel1.text = "Panel";

    panel1.preferredSize.width = 200;

    panel1.preferredSize.height = 200;

    panel1.orientation = "column";

    panel1.alignChildren = ["left","top"];

    panel1.spacing = 10;

    panel1.margins = 10;

var treeview1 = panel1.add("treeview", [0,0,190,73], undefined, {name: "treeview1"});

    treeview1.alignment = ["fill","top"];

var treeitem1 = treeview1.add("node", "TreeItem");

var treeitem2 = treeitem1.add("item", "TreeItem");

var treeitem3 = treeview1.add("item", "TreeItem");

    treeitem1.expanded = true;

dialog.show();