In America, you basically need insurance to act as a larger stronger party in the negotiation of prices with the hospital on your behalf. Without the bargaining power of the insurance company the prices you'd pay can be significantly inflated. So paying for the insurance is the slightly lesser of two evils. Supposedly. From your question it seems perhaps you live somewhere with a saner system in place. I'm envious.
I’ve been told that too. But I’ve done self pay for the last year, and every time I go to the hospital they instantly give me a 30% discount.
That makes me think they are artificially inflating prices so that when the insurance company negotiats their discount, well, it might be the same as what I pay