I truly don't understand the whole problem with different launchers. Just doesn't seem like a big deal to me.
It comes down to features. I like to occasionally stream my games to my steam link. I can't do that with other launchers. I also like being able to pull up the steam game forums to look something up if necessary. The list goes on and on. How it should be is that the game is released on all launchers, then you let the people choose where to buy it.