Earlier quoted context omitted.
Sometimes "other developers" is also "coworkers". I've found less ambiguity to be a better thing than not, where possible. Self-closing a tag that can't contain anything is one such example of removing ambiguity for "hobbyists".
One would need to know the tag is self-closing in order to put the closing slash in. Right? So if one knows it's self-closing already, why do they need to add the extra weight? Makes no sense. If one wants to add content to a self-closing element, one has far more problems than we're talking about here.
Yes.