Why do modern pop songs have so many credited writers?

"Why does it take at least five songwriters to write a chart-topper today when it used to take one or two? Are musicians just less talented?... If it’s not talent, then what is it? In my opinion, it comes down to three factors: money, the computer, and the changing definition of what songwriting is" - musician Chris Dalla Riva goes into the issue on Tedium.