I am glad you are finding the posts useful. It is always good to know that someone has a similar to-do list as it confirms that you are at least on the same page as other people :)
The way I would look at it at the moment is that it provides a nice self-service interface allowing you give people access to deploy containers on dev servers which may free up time to allow you to concentrate on managing production.
Both Portainer and Shipyard currently occupy the same space. While there is no Docker Compose support at the moment, however, you can add customisable templates, see https://portainer.readthedocs.io/en/stable/templates.html for more info.