Neck hair is, hormonally, facial hair, and it responds like any other facial hair. So, yes, laser or electrolysis. Lucky me, mine is mostly white, so it's all electrolysis. And it's all wiry, tough hair, so most of them require double zaps, and that hurts!
I never had much body hair, but what I had changed dramatically on HRT. My chest hairs (about two dozen of them) went from robust and dark to finer than spider silk and transparent. My leg hair, again never very thick, it likewise lighter and thinner. I can get away without shaving them without looking like I just wandered in off the commune.
Not so my neck hair. It is beard, and has to be dealt with as such.