You missed the "That code will be unmaintainable" part.
When your code is unmaintainable, what you have is a big pile of really hard to solve bugs, adding new features becomes a daunting task that tends to create even worse bugs, and the project ends dying in a long and painful agony.
Did you ever used a software that was always broken and was a pain to use? That's exactly the kind of experience an application with unmaintainable code gives its users.
The list of facts exposed in her last paragraph should raise alarms, too; but I guess you don't care about developers IQ, water and energy prices, having a survivable planet, or the people that gives open source to you for free.