Again, this is a CS/Math major kind of thinking. The term __main__ means nothing syntactically. If we care about language acquisition -- thus language adoption -- it is always better to make "very common terms" in the language understandable to someone who is completely illiterate to your formal language.

I honestly think one of the main reasons why python is so successful is as simple as:

    print "Hello world!"

...and later:

    print("Hello world!")

It might not seem like much, but when you're asking someone to pick up a language outside of a classroom setting, it's just much more intuitive than:

    echo "Hello world!";

or:

    console.log("Hello world!");

or god forbid:

    public class GFG{

        public static void main(String[] args) {

            System.out.println("Hello world!");

        }

    }

These little things matter in the long run, even if they don't seem like they matter when you're already fluent.