I'm not sure what the West is, but I live in eastern europe and I have no idea what an electric purifier would even look like. Someone might order bottled water at a restaurant, but I'm pretty sure everyone drinks tap at home.

From what I've seen Germans seems pretty suspicious of their tap water(or maybe just hard water?) and use brita filters a lot. There is no actual health benefit or harm avoidance for using them as far as I understand.