I don’t like the idea of discarding precision for smaller file size. There should be an option to keep double-precision floats instead of single-precision like you mention in your post. Otherwise, the data gets useless for high zoom levels.

From what I can tell, OsmAnd uses single-precision floats, which gets very noticeable when zooming in.

See this comparison between Carto and OsmAnd:

While I’d appreciate a visibility toggle for this feature, you do realize that all data you submit to OSM is entirely public and pages like https://hdyc.neis-one.org reveal way more information than a simple contribution graph like this?