• It's limited to the custom indexes that are created on purpose.  Assuming that other indexes are by nature already specifically created to address specific performance in the first place so they aren't designed to check those.  I suppose if you wanted to you could check all indexes but I have not had an issue with the delivered indexing so did not put a check on all of them since this seems a bit more than would be necessary on delivered indexing.  Also the scans check is mainly concerned with actual user input rather that any percentage basis on the indexes themselves.  This is so you address actual user performance as opposed to a database performance optimization.