1) Assumption: the compuer component contributes non-trivially to the
intelligence of the entity, once the entity comes into existance
2) Observation: computer hardware and software technology are advancing
at an empirically-observed exponential rate known as "Moore's Law",
which we both agreed is unlikely to change in the near future. This
rate is dramatically faster than the 30-year sustained rates of
increase
of the other technologies you mention.
3) Assumption: a more-intelligent entity can develop
intelligence-augmentation
faster than a less-intelligent entity.
4) Conclusion: This is a fast-feedback loop.
Best I can do concisely, Robin.