You're conflating two different pluralizations (and doing it incorrectly at that)

Yeah, I know. I originally wrote metropolises, which just looked, and sounded wrong. I was too lazy to look up the proper pluralization, and it was less work to backspace over three letters and add the -i suffix than it was to backspace over the whole word, and replace it with "cities". Of course, I get Bitted and end up typing far more in the long run, but I was gambling on you recognizing that my -i was offered in the same manner as pluralizing "moose" to "meese".