Special attackers are living the good life in this game. Let's list all of the ways that physical attackers get screwed over.
>rocky helmet
>rough skin / iron barbs
>static
>flame body
>poison point
>effect spore
>cute charm
>gooey
>mummy
>aftermath
>intimidate
>king's shield
>spiky shield
>the burn status
>confusion dealing damage based on your attack stat
>foul play

Hell, even the moves are worse. Compare wild charge or thunder punch to thunderbolt. Special attacks also tend to have more "utility" moves such as scald, discharge, or lava plume. The only thing physical has going for it is knock off and most priority moves.