I am going to change the policy on comments on 5th of July. The reason is spam and the problem it brings. Mostly the problem is false-positives in the spam detection system. I do not always see those false-positives, so sometimes comments get missed and deleted for that reason.
Comments are still going to be open for everyone. But what changes is that people have to register to comment. The register option is in the “meta” group under the Amazon ads. There is also log-in to comment. But people should also be able to register and log-in from blog posts once I make the change.