[astrobe_]

For "large" projects you do as every other language does: you link/FFI to the C library that does the heavy lifting for you. It's kind of unfair to say "forth can't do browsers" when all browsers are implemented in C/C++ at the core.

[white-flame]

You link to C when you need speed, and that's not even usually necessary anymore in languages like JavaScript or Lisp. Linking to C doesn't let your code somehow abstract higher, to deal with larger projects and larger architectural scopes.

[alexdowad]

It may allow you to take advantage of existing libraries, however.