

I was replying about the imagery only, a PR to the layer index.
Adding the imagery to the index and making it the default is the solution to the problem of users undoing changes. Most new users just hit edit on osm.org and start to work with what they have. If you present them the correct imagery they will use that.
On the layer index you can mark an imagery as ‘best’, and it will show up as the default layer for its country
Osmand uses a different search engine. It also searches only in the downloaded data, unless you select “Online search”.
More info in the docs: https://osmand.net/docs/user/search/
OSM is a database, it can’t search. Osm.org just displays an independent search engine called Nominatim, but it could be anything else