Then credit the people who actually did the artistic input - the composers, the writers, and so on. Not some manufactured figurehead identity slapped onto an algorithm.

The composition remains to be done; but the actual production of vocal sound is also considered artistic.

Why can't a vocaloid have a personality? Does Gregory House have a personality?

Gregory House is the main character of a TV show that has actual plots. Vocaloids are just animesque moeblobs.

Furthermore, Gregory House is not credited for programmatically singing songs actually written and composed by humans.

I think the idea of "Miku" is a stand in for a large group of people, just like "Google" is.

Except people don't treat it that way. In any case, our senses don't work that way. If it's anthropomorphized (pointlessly, in this case), we automatically think of it as having the qualities of a person, whether it makes sense or not.

I, for one, do care about the artist's personality.

I value creators - be they writers, artists, directors, or composers - best when they have a reason to do what they're doing. When they have an aspiration, a passion for art, or a message they want to relay to the audience. I like analyzing works and trying to understand the author's mindset, figuring out what drove them to do it the way they did and what they were thinking at the moment, and how it relates to their historical context, etc.

All of those are human, relatable, empathic qualities.

But idolizing a hollow software moeblob that only does what it's told? There really is no wonder it's Japanese. It's the same kind of worst excesses of the otaku subculture that drive fans to conduct faux-marriages with anime characters.

Rant over.