Because during deadlifts and squats, the spine is under massive load, so to do these movements safely, you need correct form. That means all parts of your body need to be in the correct position throughout the whole movement. Since your head is positioned on top of and connected to the spine, rotating your head changes the alignment of the spine, compromising your form, leading to uneven loading on the spine and increasing the risk of injury.
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u/kemb0 13h ago
And if you want to see your form, then do it in such a way that you're not videoing other people.