I mean, your post is correct from end user (gamer) perspective - Steam is awesome, everyone loves it, and the few people who don't, love GOG instead.
But Sweeney has always been about the developer perspective. "We developers are the ones who invest and spend years of our lives to make games. We should therefore make lot more than 70% from our games when we do all the work and stores can operate with significantly lower cut while still being profitable."
That is the issue he wants to change. And I do not begrudge him for it; if he had chosen better approach, such as making EGS:
- functionally better than steam, perhaps also offering Epic's version of GOG connect
- offered better prices on most games due to Epic's voucher
- offered free games
- offered exclusive games fully funded by Epic (and thus zero moneyhatted away third parties)
- was much better marketed
I would applaud him for it.
Sadly, he had chosen the antagonizing way. We will see if it will be successful, but I doubt it. Carrot would work better than the stick.