So you don't _have_ to replace everything. But there's a compelling economic argument in upgrading the components in the Solar array as better ones become available.
I guess you don't need permits for upgrading to newer components.
I guess you don't need permits for upgrading to newer components.
And because thus is an economic pressure/incentive, its really the opposite of what the original quote was suggesting. In 20 years we throw it all away because there has been amazing improvements doesn't gel well with their "this will last 60 years" statement.