Automation Weaknesses

Over the last few weeks I have been struggling with automating deployment and testing of virtual desktops for my own edification. This struggle has pointed out automation weaknesses which need to be addressed for automation and the software defined data center to succeed and not only be deployed from software but also self-healing and all the great things we associate with SDDC, SDN, etc. But current automation has some serious flaws and weaknesses. In essence, in order to automate something you must have a well known exact image from which to work.