If it's more fair to tax profits than revenues, we should be advocating for individuals to be treated in the more fair way, rather than advocating for corporations to be treated in the less fair way, don't you think?
Besides, corporations generally have outside sources of funding other than income, while people generally don't. Thus corporations can run at a deficit, sometimes for a long time, while they figure out how to turn a profit. Do you think there's really a societal benefit to drive new businesses into bankruptcy before they get their footing by taxing them while they're losing money?