One significant problem is that teams have much more negotiating power than individuals. Which is why teams that stay together are consulting agencies. To put

One significant problem is that teams have much more negotiating power than individuals. Which is why teams that stay together are consulting agencies. To put it simply: The software development department of a company might bring the company $10 mil value. A consulting agency with great sales would bill them $9 mil to do the work. Individually hired developers might be paid a total of $1 mil. If the company hires an entire team, eventually the team figures out that they bring $10 mil value and can easily negotiate their pay up to that because they coordinate together. Individual developers almost never coordinate like this.