You are at best naive if you think people use vim and a terminal instead of "better graphical alternatives" (which there are none of if you've really gotten into vim/emacs/whatever). And we don't do it to seem hardcore (maybe we are, but that's a side effect). Software in the terminal is often more simple to use, because it allows chaining together outputs and has often simpler user interfaces.

The second paragraph is word salad. Developers should name their shit properly regardless of editor and it's quite simple to have a professional dev setup with 'intellisense' and auto complete in neovim. In fact, vim/neovim and I assume emacs too have much more features and flexibility of which users of IDEs or vscode wouldn't so much as think of.

I assume your prejudice comes from the fact that vim is not a "one size fits all no configuration needed" integrated development environment (IDE) but rather enables the user to personalize it completely to their own wishes, a Personalized Development Environment. In that regard, using one of the "better graphical tools" is like a mass produced suit while vim is like a tailor made one.

Just let people use what they like. Diversity is a strength.