Dont forget that in many European countries it is not easy to fire people. That is why the 6 months probation period takes place. However the amount of bad hires I have seen is immense. There are so many people coming into the industry because its hip or because its easy money with knowledge from an online course that I could not hire them.

They miss basics of OO programming etc. And then what? you take him in, which has costs time, money, hardware to let him go within a month? On the other side I think you can weed these out quite fast with 1 personal interview.