Ancillary benefits are a factor to consider, and in most cases are the real benefit the user wants - with the energy savings being the ancillary argument. We all lie to ourselves when we want candy, let's face it.
(Note: The contractor-grade heat pump is now ten years old. It appears to be on track to easily make it to 15 years, without significant maintenance. The hydronic system blew its guts out at year 12).