While I am philosophically against them, exclusives might work at building up market share against Steam, but not when your store is shite. Then you just create ill-will towards it. Where's the value in the Epic Store that other stores don't offer? There really isn't any. In fact, purely from a service level, Epic provides little more in terms of features, functionality and (arguably) security than a torrent client (and I'm not encouraging piracy here - it'd be better if people just ignore EGS exclusives than pirate them), so if you're of the belief that piracy is a service issue then EGS is only going to cause one thing.
If Epic wanted more impact among consumers, they should've spent their money building something amazing before buying up exclusives. But they thought the games would be enough and that, like cattle, consumers would just march wherever they were told to go. Now Sweeney is having Twitter meltdowns over it while a bunch of myopic developers and pundits scream "YEAH!" at his inane, Trump-esque tweets.
I get that it's hard to build up market share against such an overwhelming force like Steam, but they went about this completely the wrong way, and I really don't see a way out of the hole they've dug for themselves. At this point the more exclusives they buy, the angrier their potential customers are going to get. And it's a shame because Epic had the cash and clout to really build something incredible with EGS that would actually provide value to consumers and give Steam a run for its money, but they blew it through laziness and trying to buy their way into a market they'd earned no place in.
Not quite the same, you don't need to buy another gaming platform to play an EGS exclusive. You just have to let go some loyalty features (trophies, chat, friends) and partition your game library in two "shelves". I'd say is not such a big inconvenience.
Say it's "not such a big inconvenience" to people who use Steam Controllers or rely on Steam Link to play their games, but thanks to EGS they can't because the client has made their games incompatible with those features (even when you add it as a "non-Steam game").
Or how about people who like to use pre-paid cards as currency to buy their games and DLC with? In some regions, that is far and away the number one way to buy games, but Epic will never do it because their unsustainable 12% cut makes that impossible.
There are lots of reasons why EGS is bad for customers, and to oversimplify it to "not such a big inconvenience" (coded language for "you only have to click a different icon on your desktop") at this point is wilful ignorance of the subject and bad-faith arguing.