The standard library alone has a huge scope which includes a (mediocre) GUI toolkit.

I did not meant to start a pissing contest, I thought the biggest idea was that Flutter isn't 35yo and because of it, it's more likely to drastically change, and in a fast way too.

It includes another scripting language with a GUI toolkit. The Python part is just a shallow wrapper over third party code.

If only some homegrown GUI toolkits were half as good as Tcl/Tk.

Have you seen the python standard library? It ain't JavaScript kiddo