The new environment feature in the portal is very useful. Apart from making it visually clear which instances belong together, it also makes environment promotions a lot easier than before.
There is a drawback to the current implementation though: each environment is expected to be part of a single linear chain: 1 → 2 → 3 etc. I think it would be useful to have the option to have multiple chains. You might require a separate setup for HR compared to other data but want to be able to manage them from one place.