Literally no coach in the world would agree with this.
Its like thinking that the best way to become a F1 driver is to jump in your car and drive as many miles as you can.
You need deliberate, dedicated practice with feedback from a knowledgeable observer in as close to match situations as possible. Mindlessly smacking rubber hockey balls on a plastic indoor strip is more likely to ingrain bad habits than good.
surely to ingrain you want to take out as many variables as possible.. a person feeding (in my opinion) wont be as accurate as a machine.
Bowling machines have there purpose, to ignore that would be stupid, however there is a limit as to what they can achieve, to ignore this would also be stupid.
having said that every person is different, for me when im feeling out fo touch a bowling machine net is perfect, get that feeling back hit the ball great, but when im in form i like to face bowlers as its what happens in a game, if im struggling with a shot, bowling machine, if im struggling with rhythm, bowlers are better.
it all depends on what your trying to achieve