My concern on this is mostly that it's something that has/will make its way to less expensive bikes, where customers aren't expecting to spend a significant fraction of the bike's value on a headset service. And there are at least a few that do this with mechanical shifting, which has to be horrendous for shift performance.
Because it seems like this is the inevitable way forward, I don't really know what the solution is, unless brake fittings change so that the barb/olive can be fed back through the bars/stem/guides or there are "hard lines" similar to how automotive brake lines run that connect in the head tube. Of course, both of those have large drawbacks as well.
Edit: I left out another obvious one. Brake by wire!
Because it seems like this is the inevitable way forward, I don't really know what the solution is, unless brake fittings change so that the barb/olive can be fed back through the bars/stem/guides or there are "hard lines" similar to how automotive brake lines run that connect in the head tube. Of course, both of those have large drawbacks as well.
Edit: I left out another obvious one. Brake by wire!