Simple answer is, lifting with your back will cause back problems like hernias and such. Worst case scenario, you could literally end up paralyzed.
If you’re wondering why that’s the case, think about the muscles and bones in those areas. In the back, the whole structure is designed to be able to twist and turn in almost every direction. But the muscles and bones of the legs are built to bend the ankle, knee, and hip joints, mostly in one direction each. That means more muscle and bone strength are used to make those bends stronger, making lifting safer when using those muscles.
As a bonus, lifting with your legs a lot will make your butt look awesome.
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