I would not think in terms of "how much" context, but really just how the harness manages it. I've been fiddling around with harnesses earlier this year and the rabbit hole goes very deep. I eventually had to drop it because it consumed me, and I can only do one thing well. But what I learned is that there is a lot on the table at the harness level.

The elephant in the room and the constant tension is that the models do get "used" to a certain harness (trained for it by the model labs), but they also generalize well. So one really advanced mechanism could fall short because the model could fail to generalize, whereas in other cases the model might handle large deviations from how a conventional harness works better than expected. This is where the gains are.