They also serve to decentralize remembrance. A Holocaust memorial is good, yes, but it's in one place you're probably not going to go unless you want to. Stumbling stones can be randomly encountered while you go about your day and remind you that someone who had their life ruined once lived here.

That's precisely why right-wing politicians oppose them in favor of centralized memorials.

They presumably also have to be replaced from time to time and im assuming that would fall under "new" as well.