That was only six month ago. I don't think this is an argument that things are slowing down (yet).
Progress isn't a smooth curve but more step like.
Also, the last 10% of getting AI right is 90% of the work, but it doesn't seem to us humans. I don't think you understand the gigantic impact that last 10% is going to make on the world and how fast it will change things once we accomplish it.
Personally, I hope it takes us a while. We're not ready for this as a society and planet.
Thus, I think we can compare them to electricity - a sophisticated technology with a ton of potential, which will take years to fully exploit, even if there are no more fundamental breakthroughs. But also not the solution to every single problem.
Your car example is a perfect one -- society was _completely reordered_ around the car, even though the fundamental technology behind the car didn't change from the early 20th century until the invention of the electric car.
We are just getting cars of different shapes and colours, with built-in speakers and radio. Not exactly progress