Why? Certainly one would expect the form of the discussions to be a bit different - eg, as part of a performance eval tool, instead of a company-wide discussion

Why? Certainly one would expect the form of the discussions to be a bit different - eg, as part of a performance eval tool, instead of a company-wide discussion - but I don't see why it would be a disaster. In fact, given the number of people who said this would be a disaster for a company of 25 people two years ago, there's an even greater onus to provide real reasons transparent salaries couldn't work at other companies.