Oh please, Steam has tons of ads, which brings in a lot of revenue to pay for those features, Epic Store doesn't. It also took Valve 10 years to get it to that point. Epic have already promised a lot of the same features too, including reviews, cloud saves, achievements, and social features. As far as I know they also already have the same kind of refund policy as well. They don't seem to be intent on having a forum, but honestly, the Steam Forums are pretty bad, and poorly moderated.
Also, Epic doesn't designate whom the savings go to, that's up to the contract between the pubs and the devs. There's certainly much better chance of the devs saving more with a 60% lower distribution fee than Steam though. And distribution is part of marketing , pubs generally handle those costs, that's part of their responsibility.
And Valve hasn't done the same with Steam by enticing gamers, developers, publishers AND advertisers? Don't kid yourself, they're all out to make money on this kind of thing. All you can really say about it is it will take Epic a LOT more volume to net the same amount with such a smaller cut, especially since they don't take in anything from ads. If anything that makes Valve look like the greedy ones. They've amassed so much revenue from Steam they don't even need to develop anymore. Valve are very eccentric, ask anyone who's worked there and been fired for not going along with their regime. They wasted tons of money experimenting on Steam Box only to fail miserably. That's what their wads of cash from high distribution costs has done to them.
@Deadhound,
All the gamer is going to see is that games have more chance of costing less when there's a substantially lower distribution fee paid by the publishers. That's why World War Z on PC is $35 instead of the $40 it was going to be on Steam.