Yes, coercion and fraud are bad, but you'll note that you're indicating that the quality of consent appears to be on a sliding scale from 'we're reaching a real agreement between well informed equals that stand to benefit from a transaction' to 'an unsophisticated economically distressed person is forced into taking a poisoned deal'.
Yes, the law recognizes that not everyone is sitting firmly on the 'ideal contract' side of things, which is why in areas where there are systematic issues, it modifies the way the contracts work.
>Such as? Last I checked, nothing stops me from offering cheap junk for a ridiculous sum of money, nor is there a law preventing me from attempting to hire workers well below market rate.
Perhaps you don't believe labour standards, collective bargaining rules, minimum wage, and other pro-worker laws exist, but they do.
If you want to know more about the specific frameworks that exist in your jurisdiction, you can just look up any employment law digest that covers your area. If you're an employer most jurisdictions have 'employer community' circulars that contain employment law related briefs in a short newsletter format that tell you things like "Don't sexually abuse your workers" and "Don't let your workers collect evidence that you pinch secretary ass regularly".
In fact, if you're in the civilian legal world, the entire field of nominate contracts is essentially the legal community fixing systemic problems associated with different fields of contract, one by one.
Maybe you hate labour laws specifically, and want to ignore the idea that 'contracts as an idea can be gamed'. Take a look at the SEC, then. They perform the exact same function, but for wealthy investors. Do you hate them too? Are you upset you can't release yet another vaporware ICO to fleece a few hundred crypto hopefuls? I really hope not.