My assumption when I would share a document would be that people would not see the different colors / history of the document. If I were to use this in a professional capacity and share a document with a client where I had set my view to not see the colors, but they had not, and I shared a multi-colored document, it would look unprofessional. I would also not necessarily expect that a document I didn't see colors on would have highlighted text when shared with someone else.
Another fix strategy I could imagine would be to have the default collaboration uncolored and to "opt-in" or "turn on" the feature.
My assumption when I would share a document would be that people would not see the different colors / history of the document. If I were to use this in a professional capacity and share a document with a client where I had set my view to not see the colors, but they had not, and I shared a multi-colored document, it would look unprofessional. I would also not necessarily expect that a document I didn't see colors on would have highlighted text when shared with someone else.
Another fix strategy I could imagine would be to have the default collaboration uncolored and to "opt-in" or "turn on" the feature.