It's hard to come up with a short answer to explain the greatness of the tightly integrated system with tons of functionality and highly sophisticated function/rule based programming style, but let me give you a quick taste of it: the following code

    CloudDeploy[
      FormFunction[{"a" -> "Number", "b" -> "Number", "c" ->    "Number"}, 
      Plot[#a x^2 + #b x + #c, {x, -10, 10}] &],
        Permissions -> "Public"]

will create and deploy a publicly accessible web form that asks for 3 coefficients and plots a parabola. How many lines of code / external libraries would you need to do the same thing in python?

https://www.wolframcloud.com/obj/e0b275e6-49a2-4901-a806-e36...

Cool! Is it because the Wolfram libraries and infrastructure are great, or is there something in the semantics of the language that makes this so nice?

For me, it’s a combination of many many convenient built-in functions, and high level constructs for functional and rule-based programming. I recently played with the language to get functionality similar to what R’s dplyr provides - it can give a sense of what kind of advanced “meta-programming” is possible.

https://community.wolfram.com/groups/-/m/t/1901462