That would make sense. Unfortunately, first class is at the front, and that boards first. It sort of flows from there.

I’ve also seen enough people abusing the overhead lockers to completely break back to front boarding. They get on and just stick their bag in the first available space, before heading back. Now, when the people at the front board, their bag space is taken up already. They now have to fight to the back, on landing to get their bags.