COBRA costs you exactly how much you + your employer were paying for that insurance.
It's expensive because your employer's share of insurance was a significant part of your compensation (And because US healthcare costs are pants-on-head insane.) I'll point out that it's generally quite expensive to, like, stop getting paid.
Practically, post-ACA, health insurance in the US is about as tied to employment as having a roof over your head and food on your table is. If you don't have employment, or money, you're going to be in trouble - but that's the case with everything you need to live, not just healthcare.
Our regulations (including the medical guild) and legal structure (including crazy malpractice payouts for unintentional mistakes) forces everything to be more expensive than necessary. We are very far from a free market, even if we stopped with the untaxed benefits.
US healthcare is a market but not for patients. Insurance, employers and hospitals negotiate a lot. But people who get employer based insurance just have to accept what they are given. Pretty crazy.
Sure. The point is that the employer does all the selecting of options and the patient/employer has to take what the employer chose. No market for the patient.
We left the free market of healthcare behind because it was awful for consumers. People who were disabled or otherwise had chronic conditions were, more or less, completely screwed. Not to mention these regulations are very much necessary. We want educated and highly certified doctors cutting you up.
Aren't healthcare costs in line with the very high US income levels (with people spending a high fraction of their income in it, because they can afford to), and the main issue is inequality (including lack of real insurance)?