Watching a machine destroy itself because you left a wrench on the table which just happened to work itself into a mechanism jamming location can happen. Stepper motors also have the characteristic of having less speed as the size goes up. The NEMA 23 motors can work with loads up to 25 lbs. The nuts are rated at 70lbs maximum force. Using two motors synchronized you could expect to be able to move 266 lbs with two motors.
Nothing is perfect.