HJSON seems a lot simpler and closer to JSON than YAML.
And.. yeah, for human processing/reading/writing, ignoring trailing commas and having comment does improve JSON IMO.
I don't know why JSON is so strict in fact. Virtually everyone forgets to NOT have the last comma of a list all the time.
Now then again HJSON is +1 standard and incompatible with JSON so im not sure how that'll take off.