I'm not anti-transhumanism, it's just that most ways in which transhumanism is envisioned really aren't an upgrade from being human. "I'd like a tail' for example means you can't use a lot of chairs. There's little point in talking about the metaphysics.
yeah, although most of those seem to have similar issues, as Plato noted, books crowd out memory a bit, and computers possibly even more so. At least in this case the deficiency is amendable by habit, in the case of most body upgrades there's not much you could do.
