It's intersting to me that I have never used the term "microchip" in 25+ years of designing with them. Ditto for my colleagues (even when we were actually designing such devices; then it was either "die/dice", "devices", "wafers", "layouts", etc.). I almost never call them "chips" except when talking to assembly people (then, actually, it's usually either "IC" or "diode" or "transistor", etc.).
"Chip", IME, is a popularized term that, due to use by the public-at-large, has almost no concise meaning. This makes it difficult, if not impossible, to "nail down" its meaning.
It's more interesting to me, however, that even when faced with expertly-sourced information, people would continue to argue anyway...