Look, I get the irritation. But you need to admit - at least to yourself - it's a purely emotional reaction without any logic behind it. You have no objection to Steam - and yet, this was exactly how Steam was able to capture a large market share, by exclusivity. Surely, you still remember the end of the last decade, when people were saying the exact same thing about Steam as you are saying now. In fact, it was worse then, because Steam was also the first such service to require an application to be installed. Remember how people used to call Steam malware?
My first Steam game was Skyrim. I bought the game boxed. I installed it… and then it tells me Steam is required. Was I irritated by Valve's "exclusivity tactics"? Yes, I was. I even searched, unsuccessfully, for a decent no-Steam hack. But objectively, installing Steam did not harm me in any way. If it was an inconvenience, it certainly wasn't a big one.
Today, my major concern about Steam actually mirrors your arguments about the free market. Steam became such a strong platform, at one point it was practically a monopoly. Their choke-hold on the market was broken a little bit by GOG, a little bit more by Origin, and now Epic is trying to open things up even further. They're doing so using about the only tactic available to upstart underdogs in the publishing market - by paying lots of money for temporary exclusive rights.
Is this an inconvenience? Maybe not a big one, but sure, it is (particularly since Epic's store interface and launcher client is utter, utter crap!). And sure, it feels nasty. But free market FTW? This *is* the free market in action. Some developers will work with Epic. Others will stick with Steam. All will benefit, because Steam will be forced to adjust their terms to stop them going to Epic. In a few years, you'll wonder what the big deal was.