> If the reason of this change is that these comments will be lost by DDMD conversion, please leave them as-is until conversion is actually done. It does not become strong reason of eager removing.

No, I'm removing them because they will be lost during conversion _and_ they appear(ed) to be useless.  Other comments that cannot be converted will be turned into comments that can.

If this is useful, then it should be re-written as a comment that people other than you can understand.  I'm assuming it can be expressed in words.  I don't know what this comment means, but I'm suspect you do!  Please tell me and I'll update this pull.