I have no problem with competition, but don’t force me to use your inferior product. If any of the major companies developed an actual competitor with the Steam launcher (in terms of features, not just a lousy storefront), it would likely get some use. If they somehow made it better than Steam, plenty of people would likely jump ship.
Epic is just a failure of a launcher. Nobody uses it over Steam by choice, because it’s lacking in nearly every way. While I’m not big on exclusives, if the launcher was a reasonable Steam alternative, they wouldn’t bother me nearly as much. As things stand, I’m firmly in the “fuck Epic” camp.