You want back to front and window to aisle. It won’t help when the plane loads front to back whether it’s window to aisle or not
https://youtu.be/oAHbLRjF0vo?si=8NRov1SyjtNxIOsF
Funnily, just opening the gates is near ideal for boarding. Doing almost any grouping slows things down more than random boarding.
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A lot of commercial planes are tail heavy, loading a bunch of people in the back first is going to tip it. Doesn’t even need to tip all the way to cause damage. It’s a scary thing to see in person. So yes it does matter what order people are seated in.