Because, this changeset covers a large geographic area.  But that isn't really the big issue.

Why do I care?  Because I am tired of having to clean up all the vandalism by golf mappers.  There has been a ton of golf vandalism to this volunteer open source project, which has resulted in a lot of edits and changesets being reverted.  Some even just putting things like "Golf Course" then tragically damaging major roadways like I-80.  Putting in a bit more detail like "Added holes at ####" or "Adjusted cartpaths at ####" is immensely popular.

You can read more here:
https://wiki.openstreetmap.org/wiki/Good_changeset_comments