Comment by SideburnsOfDoom

I think there's a slight difference. Amara's law is about "a technology" - just one - and its initial impact vs second-order effects.

e.g. Twitter started out as a micro-blogging platform, and it had impact in that area. But the real impact on people of this kind of fast social media came about from it's longer term use in shaping public discourse, and how that role is weaponised.

See also the saying "We Shape Our Tools, and Thereafter Our Tools Shape Us"

As for the other quote, I don't know if it's true that "we massively underestimate what will happen in the next two years" but it seems to be a statement about the volume of change, the number of new things, rather than the continued impact of one.