[mcbain]

The in-frame patch panel (aka junction box) may require pulling a few other things off the bike like the cranks (if access is through the BB cluster) which is often only a few minutes work when you have the correct tools.

Which leads to the fact that many bike tools are incredibly specific, and require updating almost more often than the parts they are meant to be used with. Insert old joke about standards and having so many to choose from - but that's an issue that stands to the side of electronic against mechanical parts.