I’m serious. I just don’t get people. How can you not appreciate the historic change happening right now?"
That's not how software development works. At all. The actual coding itself is but a fraction of total time spent.
Why aren't people more excited? Because for the vast majority of developers there's no tangible upside. When I'm more productive, will I earn more money? No, because everyone will have this capability. In fact, this will only increase delivery pressure on already overburdened people. When I'm more productive, can I go home early? No.
The only significant, widespread tangible benefit I see is that the type of work everybody hates doing (for example writing unit tests) becomes significantly easier.
The other aspect that the author seems to totally ignore is the mood that this might ultimate replace a lot of people's jobs. Or that it will intensify competition as development becomes even more competitive. None of these are considered good things for many people.