So does HTML/CSS+JS. A project aiming at simplicity probably isn't one to criticize for lack of features.
the mechanism for using both the projects is the same -- include a JS file. If the effort to use both is the same, why would I not use the one that has more features?
Maybe he doesn't need the features, or maybe it is slower
I always chuckle when I see people trying to use Markdown in HN.
Here [1] is the list of "features" HN supports in the comment section.