Unpopular Opinion: Epic Store competing for timed PC exclusives by offering publishers a much larger cut of sales is the market competing and I have no problem with it - even though their feature list and support are not yet up to par with Steam.
Further, I think having a game engine tied to further savings for publishers is smart business and creates a fiscal incentive to make the game engine as powerful, versatile, and user-friendly as possible - which is great for gaming. I'd be impressed if this caused Valve to reassess their cabal business practices and/or open a separate (more traditionally structured) development studio.
However, none of that is as important to me as the games. Ultimately, I go where the games are. I've been buying Nintendo consoles my whole life that collect dust except when the 2-5 games/year that are good are released on them and installing different game launchers for various publishers and MMO services as needed. To me, this is all NBD.