Currently, every edit inserts an entry in wb_changes table and this made sense during the time wikidata items were mostly used in Wikipedia but currently significant proportion of edits happen on items that don't have any wiki subscribed to them so dispatching doesn't make sense there at all.
This would:
- Reduce the size of wb_changes and binlog in s8
- Make the prune script faster
- Reduce the load on master of s8
- Reduce the replication load
- Makes the deferred update for it faster (or if it's part of saving the edit, which it shouldn't, reduces edit saving time).