Docker Inc. desperately wants to be VMware. I don't think it's a coincidence that the official documentation is so full of virtualization-like choice of words you'd be forgiven if you thought they already were.
They do however seem to be cutting so many corners technically, that the risk is they get undercut on their core offering.
They have effectively no incentive on getting rid of bugs in the core product or to test features they do add exhaustively.
Sooner or later someone actually using containers will produce a docker replacement that will take over unless Docker focusses on what actually matters.