I see where you're coming from. I totally agree that how easy it is for a company to change a codebase depends on the talent it has. But i think you can separate the entire codebase+ecosystem+team codebase from the quality of the codebase itself.
To use a simple analogy: you could argue that a modern Macbook is easier to maintain than an old Dell desktop, if the Macbook is owned by a certified Apple technician who knows how to microsolder, and the old Dell desktop is owned by someone who doesn't know how to use a screwdriver. But that doesn't change that, to change a hard drive, one needs much more skill and fancier tools than the other.
