The error messages you get from the command line less compiler are.. less than helpful. Say you have a typo and use an undefined variable - if you use @imported

The error messages you get from the command line less compiler are.. less than helpful. Say you have a typo and use an undefined variable - if you use @imported files, which you will do for any site of a reasonable size, it's just a JavaScript error and you will have no idea whatsoever which file the error is in, much less which line in the file. It's terrible, actually.