I'm assuming this person hasn't actually used Delphi...or Python Tcl/Tk.
I can throw together a very nice looking GUI app in one sitting in Delphi, where laying out the elements and binding and defining events is absolutely trivial.
In Python, with Tcl/Tk, I don't. I use C#, qt, or even flask. Tcl/Tk is absolutely not appropriate for RAD GUI development, unless it's at some hello world level of complexity.
For my scientific needs, it was more than adequate, and scientists are a big part of programmers (but not necessarily professionals). However in that league eye candy does not count, instead saving lives or making our world better are of bigger priority. Tcl/TK or in its incarnations ScicolsLab/Tkinter/ Ocaml-Tk have saved the day very often.
For Tcl/Tk, there's vTcl which resembles Visual Basic 3.0 (for Windows) as far as laying things out. It supports all three of Tk's geometry managers (grid, pack, place) and you can simply drag-and-drop your way to a GUI in seconds if you're into that kind of thing.
Further, there are several experimental projects that support running Tcl/Tk over HTTP/HTML rather than X11, Win32, SDL, the current Mac OS X/macOS GUI system.
I can throw together a very nice looking GUI app in one sitting in Delphi, where laying out the elements and binding and defining events is absolutely trivial.
In Python, with Tcl/Tk, I don't. I use C#, qt, or even flask. Tcl/Tk is absolutely not appropriate for RAD GUI development, unless it's at some hello world level of complexity.