Usually, people who point out that money is a human-made construct are not trying to say that money is useless. Rather, they're trying to encourage you to question how money is constructed, likely because they think that making some tweaks would lead to it being more useful.

Kind of like people who tweak fonts to make them more useful, to stick somewhat close to your alphabet example.

I didn't say it wasn't useful, UBI is using money still? It's all about distribution of resources.