The main reason that track changes is so horrendous to work with is that MS formatting is a lot more complex that ascii. It does kind of work, if you are strict

The main reason that track changes is so horrendous to work with is that MS formatting is a lot more complex that ascii. It does kind of work, if you are strict about the kinds of changes you make and start from a fairly fixed template. Some kind of markdown would be better but even that gives complexity which just isn't there with code.