In a lengthy interview with GameDaily BIZ, Harmonix CEO Alex Rigopulos offered his thoughts on air drumming – the preferred form of percussive input in Nintendo's Wii Music, skillfully demonstrated above by a professional – and explained why Harmonix felt the need for an actual drum peripheral on the Wii. After considering using the Wiimote in an air drumming capacity, Rigopulos says, "We backed away from it because we found that the tactile element of actually hitting a surface when you're drumming is a fairly critical part to the visceral feel of actually playing drums." So, with air drumming, you're missing "a critical element ... in the experience."
Not much of a surprise coming from the head of a company currently shipping a giant, plastic drum kit, sure, but we were surprised to learn air drumming was ever even under consideration at Chez Harmonix.