I agree with you. YouTube just works straight forward in the Steemit portal page.
From what I can see, the main problem comes from the fact that DTube does not have any embeding tool as the one that YouTube has.
If there was one, it would be very easy to just add it to https://github.com/steemit/condenser , as a JSX element like the YouTube one.
But first there is a need to create an embeding tool for DTube. I will try to take a look at the DTube code at GitHub latter, and see if there is anything I can do.