This has been somewhat discussed in First, second, third, etc. city completion badge. There are issues around something like this like if a a runner has 100% today but then new streets are added. The runner would no longer be at 100%. Would you want to keep the earlier completion date? Remove it until they complete the new streets? Keep the first date and add a second date when they complete new streets? In most cities, there are street changes, construction, etc that happen semi-regularly. In that sense we are all on a Sisyphus-esque challenge to “complete” a city.
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