It has nothing to do with Lil Builder.
The purpose of Lil Builder was to generate "standard" AHK script from drag & drop GUI editor.
This is GUI framework which is used instead Gui, Add and several other function (or in parallel) , not all to be AHK internal (like Attach or Anchor for example). It is also implementation of some wishes, for example
this one.
LiL Builder could be updated to generate Forms code out and it would be much easier to do so as Forms standardize Gui creation among custom or internal AHK controls.
In essence, Forms editor is not that much needed because its follows very simple idea consistently across modules.
It also allows for custom control creation using
Panel control. I call such high level controls widgets and one example is given as Writter control that uses Toolbar, RichEdit, Dlg, Align & Attach to implement. it. The code then may look like the one bellow without the need to know details of implementation of Writer (i.e. black box)
Code:
hForm1 := Form_New("w400 e1 h500 +Resize +ToolWindow")
hWriter := Form_Add(hForm1, "Writer", "", "w100 h100", "Align T,200")