Panels are warrantied for 25 or 30 years at a specific level of performance, with 30 year old installs still working today and 40 years is an expected lifetime for a modern panel before it will dip below that warranted level but still be producing energy with minimal upkeep.
Why do think the two countries you mention as being capable of quickly building nuclear are in fact much more quickly deploying renewables?
Panel damage happens from more than just the sun, eg. hail, sand/dust, wind, branches, etc. Warranty doesn't cover that.
> Why do think the two countries you mention as being capable of quickly building nuclear are in fact much more quickly deploying renewables?
Short-term political expediency is not an argument for technical superiority or fitness for purpose.