On what tissues do you think that 695 lbs in the front squat is sitting on, make that grinding and smashing on? Let me tell you. It's directly on the shoulder joint structures: the muscle, ligaments, joint capsule and sitting directly on the unprotected AC joint. I have tried these. The bar doesn't sit perfectly still. It rolls a little bit both ways because it is being stabilized by by what two fingers worth of pressure. If you are looking for a chance to compress and inflame your delicate shoulder structure, I'd say have at it. There a lot better ways in the gym to put load on your leg and hip structure than front squats pictured above. The ego should be left at home when picking exercises. If you do injure your shoulder structure, you can't train. Is it worth it? Not for me.