I have entertained similar thoughts, but then on the other hand people already, and with some righteousness, criticize git for being too complex. It also requires careful assessment where the wormhole ends, how many levels of grouped commits should exist.

Then I remember that I have enough trouble getting a few dozen people together to write well formed and understandable commit messages for one level of commit messages alone. This scheme would require people to extend more energy on constructing commits which is at best something very few care about.

Then there are tickets and other corresponding information, but they could rot for all I care, as they so often do, unless a decent commit log is in place.