A lot of the big building companies, in Europe, treat solar panels as a premium option and so charge a larger profit margin on them. Installing solar, while constructing the house is a LOT cheaper and easier than retrofitting them later.
The panels have gotten cheap enough that it’s no longer a real cost burden, Vs the cost of the house.












I thought it was mostly a jamming type effect. The memories are often still here, but become progressively less accessible. They then degrade from lack of use.
It might well be that a lot of memories still exist for longer than it seems. Even if not, stopping the degradation, and allowing new memories to form would allow people to remain cognitive and functional for a LOT longer.