I'll just say that for example mining is not that transparent, because you don't know who has figured out how to rent AWS, etc. Renting nearly always makes more sense than buying hardware.
This is incorrect. Most fairly launched coins are not profitable to mine on AWS, at least beyond a very short initial low-difficulty period. AWS is generally several times more expensive than your own equipment, and there is no way mining economics can support that. It was an exception of Monero due to the newness of the technology and the high level of investor demand that it stayed profitable there for several months (even with public unoptimized miners).
Which was in part a function of Darkcoin popularizing anonymity, you are correct about that, but it was also in part a function of the fair and transparent launch, visible integrity of the team, etc. because that brought investors who had rejected Darkcoin, Bytecoin and others.
You don't know who has optimized code, even GPU optimized, etc.
None of that matters if your own mining is profitable. Why does it matter if someone else makes more?
As for Darkcoin, it did do one very important thing. It showed there is demand for anonymous coins.
Agree. It did become popular and in turn popularize the idea that Bitcoin was not good enough. I think Bytecoin (on which development started before Darkcoin, but released after) or something else would likely have done that anyway, but you never know