Why do we need these things?

Is it because of..

1. We are getting older (i know how peoples hearing quality drops because of ages BTW)

2. The loudness of modern sound systems

3. Modern music cover greater frequency ranges

IMO its a combo of all of these, but seriously at what point are people gonna start realising that music damages their hearing, he loudness of sound systems cannot carry on forever. there are physical limits to hunan hearing.