Yup, and that's why I'd consider this a "101" essay. The larger exponential-growth trends (e.g. Moore's Law) practically always have a microstructure with many sigmoid curves. After you've encountered your first exponential, the "201" lesson about saturation becomes important.
And then generally all the smaller S-curves build on each other to make a curve that looks exponential for much longer, but ultimately turns out to be a sigmoid as well. One thing I muse on occasionally is whether the same will ultimately be true for technological progress as a whole.
