a percussive element has little to no attack, and a quick decay. It doesn't have to be drums, you can play a trumpet or flute "percussively". The article also

a percussive element has little to no attack, and a quick decay. It doesn't have to be drums, you can play a trumpet or flute "percussively". The article also says it's the "beat" that makes you dance. A barbershop quartet can have a beat with just vocals. I'm not disagreeing with what you wrote, just explaining why I think a kick isn't necessary for beat detection, even though it makes it easier.