Point taken about the level of discourse on the internet and the mainstream media, no argument there. It is painful, but just because the
discourse around the topic is smooth brained doesn't mean that the position is wrong. This is something that I struggle with. Sometimes the discourse is so unimaginably stupid that it pushes you to default to the other side's point of view, but that doesn't actually mean you got to that point of view through any reasoning, you got there from emotion.
There are the standard points around consumer protection. Ticketmaster, Adobe, Amazon, really do engage in anti competitive practices and then burn the consumer once they've consolidated power. People feel that, but to your point, can't articulate all the moving pieces, and that's fine, use the mute button. God help us if Kroger and Safeway get their way and merge.
To your point about "don't forget who's really in charge." - it might feel like there's no upside here, but in reality you do end up with companies that have more power than the government, and that's a dangerous road to go down in a democracy, since there's no real way to hold them accountable. Obviously the government is deeply flawed in a million different ways, but ultimately there are elected officials, which cannot be said of private companies.
Also Lina Khan talks a lot about resiliency. Too much efficiency can make things worse [1]. With mass consolidation, black swan events lead to and outsized impact compared to what they would in an economy where there aren't monopolies everywhere. Climate change, pandemics, instability in Europe and the middle east, etc mean that it's worth trading extreme efficiency for robustness.
[1] https://sohl-dickstein.github.io/2022/11/06/strong-Goodhart....