If Epic can't compete on features, they can at least attempt to compete on price. It would be nice way to try to convince people that their cut will trickle down to consumers. Have it be a launch window discount. Use their dollars to market these games via twitch and youtube. Forcing people to use your trash launcher for that one game they really want won't keep them coming back for more games. Valve didn't win by giving away Portal, they won by creating a great platform that kept you coming back for more.
They can't compete on price because the 12% cut is unsustainable long term (imo.)
Irrespective of everything though, I don't like storefronts that put more emphasis on pleasing the developers and publishers over the consumer, the developers and publishers simply do not exist without the consumer, therefore this entire approach from EGS is irrelevant.
Their argument that consumers will see the benefit has no evidence to back it up, it's trickle down economics essentially, it relies on the faith that because developers pocket more money that they will suddenly become allergic to wanting to make more and focus on pleasing the consumer with lower prices.
Epic "Hey guys, we only want a 12% cut so you can make more money!"
Publisher " Oh hey, that's a fantastic idea, more money is always good"
Epic "Yeah and since you're saving more money that means you can give consumers lower prices in the long run and make better games!"
Publisher "Or, we could just take the 12% cut, charge even more money than we would on other services for our games because now they are only available to purchase on one store and invest none of that extra profit into making better games because we know people will pay what we demand anyway?
But no, you're right, who needs more money, let's think of the consumer, we are getting bored of money anyway..."