They were explicitly saying that categorizing them separately "makes no sense". If it's hard but doable or legal to do it, that would not be a reasonable explanation for saying that the distinction doesn't make sense. Either it's trivial to do it, or there is some legitimate difference between the two groups, and having words for it makes perfect sense.
I can easily melt ice into water, but for most solids, that's very hard for me to do. It still makes sense for me to categorize ice as a solid though, rather than saying that there's no reason to categorize it separately from other liquids.
I can easily melt ice into water, but for most solids, that's very hard for me to do. It still makes sense for me to categorize ice as a solid though, rather than saying that there's no reason to categorize it separately from other liquids.