I know (it’s a problem all over Blender) and now that the UI gets an overhaul I hoped that this could get fixed at least for the most complex shader that everybody uses most of the time.
I would even be willing to volunteer to enter the default values in all the source files, if I only knew where.
This should be low hanging fruit even for a non-coder like me.
I noticed that 3rd party addons like e.g. Octane have proper defaults, so it can’t be a problem that can’t be solved.