To their credit, they're usually quick to turn around and update the info (or follow up for additional evidence that the correction is accurate)
Once upon a time I used to add data to Google Maps because they dangled some bullshit Google Drive space in front of me as a reward. No longer.
Van you explain why JOSM ? Never tried. I've used most mobile editors and the Web Id editor.
When I wanted to make detailed edits to points and the relationships between them, I often found that only JOSM supported what I wanted to do.
https://wiki.openstreetmap.org/wiki/JOSM/Advanced_editing
Splitting and combining ways are very common tasks that are trivial in JOSM but proved to be quite difficult if not impossible in other editors. Relations are used to add information such as road turn restrictions, editing these relations is essentially impossible in any editor other than JOSM.
I live at 123 My Street, and there's a nearby 123 East My Street about two miles north.
If I say "Hey Siri, directions to Home", and I'm north of both of them, it'll direct me to the wrong place. If I'm south, it'll take me to the correct home. (The closest one, it'd seem.) Same thing even if I type the exact correct address into Apple Maps.
If they are in the same city you could ask the city to rename your street 123 My Street South or something?
How about Apple figure out that streets with different but similar names exist? Or store "home" as a coordinate instead of an address?
Thankfully there's a school right next door, so I've learned to just ask for that.