Not that I want to be a prick and keep on asking questions about it but the main point about which I was confused was why the arch isn’t exaggerated and a powerlifting form isn’t adopted. It seems like if the primary aim of the lift is general strength, then increasing the weight by any means would benefit the body as a whole even though the loss of rom through the arms would slow down the development of a few specific muscles. If the entire body is meant to be strengthened by the bench, then I’m assuming the majority of the musculature, like that in the legs for example, benefits from having to keep everything stable while lifting (not because of the range of motion and the actual raising done by the arms) and the release of HGH and other hormones.