To your aside: I for one really appreciate Heroku's color scheme. I find high contrast color schemes very fatiguing, and prefer light-ish on dark-ish color schemes like Heroku's. I don't really believe in a universally ideal color scheme. I think we should instead focus on building and supporting tooling to help people adapt content to their needs.
He's probably not referring so much to the specific limits on mailbox size as he is to the policy of forcing responsibility for maintaining permanent archives on the users of the system rather than the administrators of it.
"Such policies indicate either an agency that is not concerned with preserving good audit chains or one that has an extremely penny-wise, pound-foolish approach to IT policy."
I wonder if this will eventually lead to google making use of a decentralized federated search strategy where they provide the technology to everyone who wants their site to be findable by means of google, but do not actually produce the results themselves. From a technological pov that would certainly be far more challenging than their current system, but it might make them less of a target legally.
We don't really know how common chimerism, because it is expensive to test for. It requires sampling many different tissues/ parts of the body and comparing the gentic material found in each. Some kinds of chimerism are easy to detect and are believed to be relatively common. See:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.149...
Very nearly all of modern science is based on appeals to authority. I don't have the training or time to validate even 1/10'000th of the things that a modern 'scientific' person is supposed to believe.