Amen. If you have a Resonant mouthpiece with a lively reed and a Resonant horn, that is all you need (and I have played in my share of Loud bands. Other than that , all you need is microphone and a good mix in the sound systemMy opinion is that the saxophone is a very loud instrument naturally (it was designed to serve as an improved bass instrument for outdoor use in military bands). If I can't play loud enough I'd use a quality mouthpiece with good projection (probably a high baffle with large chamber); and if that didn't cut it, it would be because I'm trying to compete acoustically with electronically reinforced instruments. In that case, you've got to fight electrons with more electrons.
I am done with blowing my brains out and modifying my instrument in counter-productive ways, when what I really need is a microphone and amp.