I was cleaning up some old files that had more than 50 keywords now that the new interface has improved, making it seem less daunting, and discovered that it is more of a mess than I had anticipated. Many of my images seem to have most of the keywords doubled, and not because I put a word in singly and then as part of phrase (although that does account for some issues) but instead some of my photos seem to have big swaths of keywords repeated in order. It's as though the system is spamming itself!
Being able to copy all, put them into a Pages (Word) document and then clean them up