>> If you're a prescriptivist, then open-source should be hyphenated for the same reason full-time, user-friendly, long-term, etc. are. That's how English works

>> If you're a prescriptivist, then open-source should be hyphenated for the same reason full-time, user-friendly, long-term, etc. are. That's how English works. > Honestly all of these exist in both hyphenated and unhyphenated usage in my experience ...which is descriptive, not prescriptive.