The relationship between a contractor and a business is more honest: exchange labor time for cash.
Between an employee and employer, enter ideology: I do this because I love it/love helping clients/ working communally to improve the business. Or competition: my bonus is 50 percent of my salary and we're stack-ranked. Or fear: oh my god, I got only Meets Expectations in my review. Will my pay be flat?
And contractors get to not have constant meetings.