> I don't see what one has to do with the other.
It is incredibly connected. There is business risk introduced for making an offer. Increasing that risk means that the vetting process can be increased to make up for that extra risk incurred. If companies feel they need 4 or 5 rounds of interviews today before making an offer and you all of a sudden mandate that there's more of a risk for making an offer, they might decide on an extra round or two of interviews to try and be even more certain about their decision.
Personally I think a lot of the issues around hiring could be solved by making firing much more trivial and less risky for businesses: this would make a lot of the process around hiring and the many extra rounds of interviews less important. Companies would be a lot more incentivized to give people they like a shot and see if they can hack it in a role or not. This would IMO be a big improvement for say self-taught developers or those with non-traditional backgrounds who can get easily dismissed because they present more of a risk than somebody who went to X good school and worked at big corporation for Y years.