I have sometimes been surprised to find that the chords I worked out for a particular recording (as opposed to my own arrangement), and which I was quite satisfied with, omitted a subtle one.
For example, I played Norwegian Wood for years without a minor seventh chord untiol, on listening to the track more closely for a performance, I noticed it coming in there. I find it more pleasing to play now.
A more refined area is wanting the basic chords so that you can transfer the song
to open tuning; sometimes this is not as helpful as one hopes.
A great frustration is when someone, usually a fiddler, starts up a set of tunes
and by just imparting a little info could have guitarists providing at least a basic accompaniment. I can say with some conviction that this would be beneficial because I've all but given up playing jigs and reels on the banjo because people haven't joined in and I feel on one's own it is pretty dull for the listener. I have tried telling folk the basic chords in advance too!