You can be right about something without bringing it up every chance you get, despite it only having a vague relation to any topic being discussed.

Avoiding DNSSEC is literally, in the literal sense of the word literally, the primary motivation for MTA-STS. The relationship to this thread is not vague.

(Source: the section of the RFC that says the primary motivation of MTA-STS is to ensure transport security when deployment of DNSSEC is undesirable or impractical.)