Agree on 1. Another big issue is the VAR refs being from the same organization as the on-field refs. That leads to buddies not wanting to hurt each others' feelings.

I like this but would extend it to being the rear-most foot of the attacker that is on the ground and the front-most foot of the defender that is on the ground. Making it about feet only and not all attacking-eligible body parts, while also making it about what is actually touching the ground, makes it sooooooo much more easily measured by VAR. No more drawing vertical lines from shoulders to connect to a horizontal line from the ground, just two lines that are easily seen by cameras and the existing lines on the field.

As it is right now, anything above the sleeves is already not classed as handball. Maybe headers are only allowed inside the box?