Totally deaf or impaired/restricted hearing ?
Yes, I was going to ask that, too. I am hearing impaired (I have approx 40% of 'normal' hearing), so for me playing music is not too restricted. The only real problem I have so far found is playing along with other people, particularly if I don't arrive early enough to choose where I sit. I have had some disheartening experiences of not being able to hear myself play or even really many other people.
Assuming, however, the original post referred to people who are not hearing impaired but are fully deaf, one benefit I can see with the Anglo is the very rhythmic nature of the playing, of moving the bellows. If I ever found myself with no hearing at all I would like an instrument which was very rhythmic.
QL