I like having the identifiers of function/method calls being a distinguishable colour, because when looking at an overall section of code, they are the 'wormholes' to other code, and so one of the most useful things to be able to pick out instantly at a glance.

But I agree with the author that if little to nothing ends up being given the base text colour (e.g. white or black) then the design is an unthinking one (less of a design process, more of a box-ticking exercise to assign a unique colour to everything that can possibly have one).