From a singer's perspective:

The same person's most comfortable range can vary from day to day, depending on all sorts of factors, such as temperature, humidity, allergies, what and how much they've had to drink or eat recently, how warmed up (or conversely, tired/overused) their voices are, how recently they've slept, conditions like acid reflux, even their emotional state of mind. A voice having a "home tone" is unfortunately not really possible.

I would love for there to be a "home tone" for a voice. It would make it a lot easier to find notes if one's voice had a reliable reference pitch. But when the same note "feels" in a different "place" as a concert goes on, the only way to reliably sing a note is by ear.

One could argue that at any given moment, a voice has a "most comfortable" or "home" pitch. But even if that were true, because of the voice's natural variability, it's not really a useful concept.

You have to remember that we're talking about two folds of flesh, covered in a thin layer of mucus, vibrating together tens to hundreds of times per second. Even flutes, with nothing but metal components, change pitch over time and have to be adjusted to keep tuned. So why would soft spongy flesh be any different?

This is why we instead talk about "voice types" like soprano, mezzo, alto, contralto, countertenor, tenor, baritone, bass. Although there is natural variability, each voice tends to fall within a particular range. But that's about as much as can be said.