In addition to my other comment in this thread (in response to shykes), I want to add respond to this:

but does not support fast, incremental build and deploy or tagging

Deploy/tagging is actually already a PR to Packer and will be merged in shortly. Incremental builds are under development. They'll make it in hopefully in the next version of Packer, but if not, the following.

And the incremental builds will work for AWS, VirtualBox, etc. as well.