It's an interesting idea, but I feel like it's missing almost the most important thing; the context of the change itself. When I review a change, it's almost never just about the actual code changes, but reviewing it in the context of what was initially asked, and how it relates to that.

Your solution here seems to exclusively surface "what" changes, but it's impossible for me to know if it's right or not, unless I also see the "how" first and/or together with the change itself. So the same problem remains, except instead of reviewing in git/GitHub/gerrit + figure out the documents/resources that lays out the task itself, I still have to switch and confirm things between the two.