I agree that it is possible to write maintainable code in any language and it is possible to make a mess in any language too. But some languages to some extent trying to force this, which may move an average project, even if only a little, to more maintainable shape.

Examples of such languages are Go and Python: both to some extent enforce code formatting - Python with indentation being part of the syntax, Go with gofmt being almost universally used tool. Both try to maintain one preferred way to do things - opposite to "There's more than one way to do it" in Perl.