[thefj]

In recent years, the price of solar panel technology has been driven down, but the cost of labor and installation hasn’t. As the framework technologies go out of date within a 25-year period, individuals and companies are facing larger costs when they are required replace both the framework system and the panels themselves every 25-30 years in order to install entirely new systems.

In contrast, the authors write that replacing panels more often with newer and more advanced models would allow cross-compatibility between the panels and the system, allowing the framework itself to remain the same while new panels are popped on and off.

So even though the installation and replacement labor is what's expensive, they assume that some kind of cross compatibility will appear, and it will be cheaper? Seems like quite a leap.