I'd go so far as to say all apparently exponential curves are actually sigmoid, but the asymptote of the sigmoid often increases itself (in another, longer-term

I'd go so far as to say all apparently exponential curves are actually sigmoid, but the asymptote of the sigmoid often increases itself (in another, longer-term sigmoid). But I don't think we're anywhere near the carrying capacity of weird shit happening; we're still firmly in the exponential-ish zone of human development.