The cynic is me would say that this is a MS attempt to take ownership and mindshare over a piece of “commodity” tooling so that devs in the ecosystem become more familiar with that than the original system, add MS/dotnet specific features and push their own system.

A modern variation of “embrace, extend, extinguish”. I doubt MS has the power or desire to extinguish containers, but getting a foot in to the deployments space would be a win for them “use dotnet because it deploys better than other solutions”.