We don't map temporary features: https://wiki.openstreetmap.org/wiki/Good_practice#Don't_map_temporary_events_and_temporary_features
If the road closure is less than a month long it shouldn't be on OSM. A lot of people use the map offline, it's better to have the default "open" state on the map for them.
Clients are free to mix the OSM basemap with their proprietary data. E.g. Magic Earth has some live traffic data from 3rd parties and from its users, and you can report temporary closures in the app as well and it displays them while driving. (Unfortunately it doesn't consider them for routing)
OSM is not a map service like Gmaps, it's a geospatial database and a community maintaining the database. OSM by itself is not really usable for end users, CoMaps and others should build their services on top of the data. This is the reason it's not licensed by some kind of CreativeCommons, but it has its own special license ODbL. It allows easier commercial usage than CC-BY-SA, which was used by OSM before 2012. https://osmfoundation.org/wiki/Licence_and_Legal_FAQ/Why_CC_BY-SA_is_Unsuitable
The routing was not working for the same reason. OSM does not route, as it's just a database. It just displays a 3rd party routing engine which uses outdated data, from before your change.