Yes, US has at-will firing, and healthcare tied to the employer, and so forth. Basically the US has made sure that the corporations have all the power, and the people have none of it. Does this make it easier to make companies? Well of course it does, just like slave trade made it easier to collect crops.
Unlike the US however, we in EU really like having basic human rights - such as mandatory minimum vacation time, healthcare that won't immediately disappear if you lose your job, or depend on the job, as well as not getting fired without cause, and without multiple warnings beforehand.
If the result of this means that we won't be successful in the AI tech scene, or that all the Musk-like slave owners migrate to US or China where they can abuse people however much they like, I'm pretty sure Europeans are not going to shed a tear over that.
I realize more and more that the main difference between Americans and Europeans is that Americans think from the perspective of a corporation, whereas Europeans think from the perspective of themselves, as human beings. We're not compatible, clearly, so there's no need to force us to be the same.