Hiding or encapsulating information is arguably part of the very nature of an abstraction; the CLIs provided by git and Mercurial could be considered an abstraction of the implementation details of the respective technologies.

As such, I fully expect each tool to hide some amount of information so that I don't have to think about the details.

There's no easy quick way to represent the actual state of the commit. It's far easier in git because it's the only way to do it. Furthermore, then information being "encapsulated" can actually become stale or misleading in Mercurial.