In the uk it seems more and more jobs are expecting some kind of work experience which can make it hard to get a foot in the door for those straight out of uni, so a placement is useful for gaining that experience to land a first job. You might find one beneficial in order to learn on the job, but whether or not it's necessary could depend on whether the country you intend to work in will require it. Some countries are easier to get a first job in than others, and have more places willing to train you up so that you can get the experience.