The typical use of demolished:highway is when construction moves faster than the newest imagery is updated - checking all imagery layers won't help in that case. I did see one with a check date of 2020-03-15, I'm not sure how significant that was if it was in the middle of a new development. The reason this changeset was flagged was the large area of the changeset and many deletions, but otherwise it looks like normal cleanup to match new development.

What was being cleaned up? Some of the deleted ways appear to be confirmed by recent surveys. Also, keeping demolished:highway tags for an imagery cycle helps keep armchair mappers from re-adding ways from imagery.

Hi, Please save changes made in one area before switching to a new area to avoid creating huge changesets that span the country.

Please use meaningful changeset comments - “2141” does not help other mappers understand what you are doing. osm.wiki/Good_changeset_comments

Please use meaningful changeset comments - “12345365” does not help other mappers understand what you are doing. osm.wiki/Good_changeset_comments

Please save changes before moving to a new area to avoid making changesets that span the country.

Please save / upload before moving to a new area to avoid creating a changeset that spans multiple states.

Welcome to OSM! I have delete your SEO SPAM (mostly no standard keys, no verifiable data or not positive verifiable address data). If this is an error, you can report it here, then we will be happy to help restore the data. For the most information in the description we have own keys. Please have look on the website osm.wiki.

Hi, please be careful when editing boundaries. This change set accidentally renamed the entire state of South Carolina to Indian Land. Someone else has since corrected it.

Welcome to OpenStreetMap! Although Bing imagery is the newest, it usually has an offset from GPS. ESRI Clarity (Beta) usually has a much better alignment. Before you move a lot of streets you may want to make sure your background satellite imagery is lined up with the existing streets in the neighborhood. This Wiki page explains why and how: osm.wiki/Using_Imagery

Please upload data before moving to a new area to avoid creating changesets that span the country.

Please save data before moving on to a new area to avoid creating changesets that span the country.

Someone has Mapillary footage of the Titanic site now?

Please save / upload changes in one area before moving to a new area to avoid changesets that span the ocean.

This one ended up in the parking lot! Perhaps Gather Greenville should be added as an alternate name to Gather Gvl (which is the name they go by)?

Please upload an area before moving onto another area to avoid giant changesets that span half the country.

Hi, why was Lake Cunningham Road set to oneway?

Hi, thanks for adding the buildings! Normally the building will not have a name unless it is special, such as the "Keowee Care Admin Building" or the name is posted on the building itself. If these are different neighborhoods, an area is drawn around the neighborhood and the entire subdivision is given the name, along with residential landuse.

Hi, it's generally better to just move or re-shape items rather than delete and redraw them.

Hi , why were all these roads changed to trunk?