Digital recording and other technology has removed many limitations from the audio industry. There is no longer any real reason that you can't use 50 or 100+ tracks mixed together to make a song. Ignoring the daunting time requirement of mixing down 100 tracks, there is way too much room for error. Sounds get muddy, and the end product suffers.
You can read more details in the full article here: http://therecordingrevolution.com/2013/02/01/why-24-tracks-is-all-you-need/