There are some that believe all the added hardware (see picture) that goes with the adjustable height saddle bridge robs the sound ... and there are some who don't.
Either way, Gibson have decided to make both versions.
'Ain't No Sunshine' is one of my favorite songs.
Story goes that when Bill first demoed it that he hadn't completed the lyrics so he improvised with the "I know, I know, I know'.
Everyone loved it and told him to leave it just like that.