We didn't explain, because it's trivial. By architecture, the Wasabi coordinator cannot breach the privacy of its users. It does not mean the coordinator chooses to not collect data, but it means it couldn't collect even if it wanted to. The coordinator only knows of the UTXOs to take part in coinjoins - so does the public - and that's not a privacy leak.
I wouldn't say explanation is trivial, especially for most newbies that blindly used and trusted your wallet without deep understanding how it works, and without code verification.
If you took time to write special blog post than you should consider that most of your customers are not developers or experts in understanding how everything works.
It was just practically speaking ser. If you read my posts, I have always debated that "taint" doesn't exist in the blockchain. But because some exchanges refuse to accept your deposits because of "taint", I believe for plebs like us, it's better to avoid further problems regarding "taint".
Let's first try to avoid using tainted dollars and other fiat currencies for every day purchases... that is mission impossible, but nobody cares about that.
I don't know why people keep thinking that Bitcoin has some special kind of
taintness, and everything else is so clean and pure.
Lightning very effectively hides the origin / history of UTXOs, so I'm very happy to see this happen.
I am happy to see Lightning Network growing and I think it's good alternative solution for better Bitcoin privacy, but let's not forget that LN is also monitored by Chanalysis and other government agencies.
It's better to think that it is already compromised, and people should in the same time work on other privacy solutions, maybe some new wallet, second layer solution or sidechain.