Same reason a 1000 HP Ford GT can't really put it'* power to use on the I/4 mile track. A vehicles chassis only allows so much torque to be applyed effieciently. After that it'* wasted, or unable to be used because of wheel spin?
A man walks into a bar with a giraffe. They both get pissed. The giraffe falls over. The man goes to leave and the bartender says, “Oi. You can’t leave that lyin’ there.” And the man says, “No. It’* not a lion. It’* a giraffe.”