I'm not sure you understood the article. You can have a very low load but each task on your queue takes a while to process, in which case you want fair distribution of work.

The distribution is fair - everything is round-robin, so in the long run each worker receives the same rate of tasks. It's just "lumpy" - sometimes you can get a big batch sent to one worker, then a big batch sent to another worker - but it will all average out.