Bench pressing on the smith machine, ugh. Calf raises are one thing, but bench pressing in a fixed line is really horrible.
If you want to do crazy HIT stuff without anyone nearby and without any safety pins, you still shouldn't use the smith. You should use another form of training. No need for rest-pause techniques.
I've said it in the other thread and I'll repeat it here since it's practically the same thread: machines are bad because of their fixed range of motion. The smith machine is even more limited with its single vertical line of motion. Injuries are just one of the many complaints you can make against the smith machine. I'd say not using stabilization muscles in an exercise is just as bad.
And even if you'd still want to do that kind of HIT stuff, why buy a smith machine. Buy safety pins, use cables, ask a friend to come spot or build your own safety mechanism.
This is a silly philosophy and doesn't take into account the limits of barbells. You are clearly anti-HIT and I can assure you the smith machine saved my life at a time when I used it.
Saying that machines are bad is asinine. Period.
Smith machines are great for squats for a narrow stance. The fixed range of motion does limit the movement in certain plains, but this is not necessarily a bad thing. You can certainly shift emphasis to the thighs without worrying about balance on a smith machine. You can also use it for benefit without a spotter or for calves.
Changing exercises also adjusts the firing patterns of muscles, so it defitently has benefit as being an exercise that the body isn't used to.
No need for rest pause techniques? According to who?