re: context chart and states. The y-axis mentions "adoption". Which is the market adoption of an item. If you click a state, I explain what that state mean. I'm certain this can be improved. So for your example Heroku: Yes they could be growing, I'm not saying they aren't, but they've come into a state where their service is strongly challenged by competitors (usually left in the chart, AWS, Google Cloud).
Re: PostgreSQL and Containers. Those are my opinion in this release. I would see state.of.dev evolve into expert/community consensus based on arguments and actual chart releases.