What external hardware amp are you referring to? Bluetooth headphones have an amp, not wired headphones. And the phones themselves will continue to have an amp as long as they have speakers.
I was responding directly to the person above me who objected to the loss of the 2.5mm jack because he can't plug his amp into his phone anymore. This seems silly to me, because if using fancy headphones is important enough to you to carry around an amp, it is negligible additional cost to also carry around a dongle.
