Epic gets a lot of flack for being a fairly simple store at the moment, but Steam's had ten years to get where it is. Competition was sorely needed and we're finally getting it.
The CEO of Epic is a big fan of open platforms and cross-platform gaming and a loud and outspoken opponent of walled gardens. If there's anyone who will move us out of this model as much as possible, it's probably him. But exclusives is the only way to fight the Stockholm Syndrome people seem to have with Steam.