Big organizations enable scaling and associated economies of scale, so it's possible for Apple to sell millions of iPhones cheaper than if they were a smaller company. I don't think that tradeoff is worth it for any individual consumer (pay a little less to be much more abused by the company), and I don't think it's worth it for society.
Most of the big corporations in America aren't providing things as useful as MRI machines, they're providing net negative garbage like social media and advertising. Big corporations like United Healthcare Group are inflating the cost of medical care rather than providing economies of scale and reduced cost for their clients.
The US desperately needs to bring back antitrust and start breaking these massive companies into much smaller pieces.
I wouldn't be alive if not for advanced medicine, but if the structures that saved my life are the same ones that constitute our own Great Filter, my life was most definitely not worth the trade. There are too many other people I love to think that.