Passive voice is unfairly vilified. I don't like it when it's obviously serving to avoid citing the agent of an action, but consider that "Z has been Yed by X" or "X has Yed Z" give the same information. If you look at the best writing, you'll find some passive constructions.

Mostly, people can't reliably identify passives - see especially these amusing (not unusual) "passive voice" corrections, although in your case you accurately identify it (except maybe you could call "X [is] sprinkled with Y" an adjective complement instead of a passive version of [somebody] sprinkles Y on X).

I agree with the meat of your complaint. I often see poor quality writing on Wikipedia, and it's fine that people want to spend time cleaning it.