That's the problem with coaches throwing pitches. I've seen it happen way too often, a coach throws to 15 batters 20 or 30 pitches a round. By the time rounds 2 or 3 come around, the coach can't throw a quality pitch and the kids trying to swing the bat suffer because they're forced to whiff at garbage pitches.
We built our own machine here at our facility.
We don't have to stop a session to change pitch location. You want 5 pitches on the outside corner? Then spin the machine a little bit to the outside. Inside corner, opposite way. High pitches? Tap the machine a couple times to tilt it upwards. And the opposite for low.
No, you are wrong as to creating a one piece swing. You can still load and stride off of a pitching machine.
They are a valuable tool when used properly.
90% strikes with the ability to hit spots and move the ball? Give me a break. A hitting coach can't do that.
To think that pitching machines are only valuable for bunting is completely ridiculous.
Use the machine correctly and you will find that it serves its purpose quite well.