Python cryptography, Rust, and Gentoo

> Each of these is a separate algebra, an extension of algebra over the reals. We don't use them in general because we don't need the additional power they offer in day-to-day uses.

... and because they gain annoying limitations (lose a useful property of the reals) with every such extension, and by the time you get to the sedenions there's not really very many useful properties they have left (associativity is more or less it).