My Steam account is old enough to drink. I've had it for some two-thirds of my life, not even adult life but life entirely. All of my games are already there. It's like if a friend invited you to come play video games in 1989 but he doesn't have the cool NES games you want to play, they're all back at my place. What, we're gonna play Clu Clu Land all day? Give me a break.
Even if I was to switch to Epic, outside of the supposed altruism of "We take less of a cut from developers!" what is the benefit for me as a gamer, or as a consumer? The Epic Games Store has very few games I can't get elsewhere, even on console, and the experience compared to Steam is just lackluster. It just is. Valve has had a lot of time to iterate on it, and Steam was absolutely despised for the first several years of its life, but the experience of using the two platforms could not be more different. Beyond that, if I do switch, I still need to have Steam installed because all like seven million of my games are already on Steam, and they can't be moved.