yes, but only if that is where they are & they can’t keep their toes up. I work with my clients to get to feet hip-joint distance apart, toes pointed up, push with the heel, keeping the knees and ankles in alignment with the hip joint through the movement. You want to train in the alignment you are supposed to have, not continue mis-alignment.
Yes-most issues being addressed, studies show there is more of a variation of muscles activity with wide versus narrow/low versus high foot placement than foot angle variation. For example, a wide squat generates greater PCL tensile forces than narrow. Narrow generates greater gastroc activity & greater tibiofemoral and patellofemoral compressive forces than wide.
-Beth Harris, CSCS