Former Windows Container wrangler. First off, why are you using Ansible/Packer against Windows Container images? You wouldn't fault Linux Containers for being terrible to use with Packer/Ansible because you shouldn't be doing that.

Second, Yea, it's only use is Windows specific languages like .Net Framework and various Win32 API applications. Windows Containers works well enough if you are good enough with Powershell to handle various levels of bullshit that comes Windows.