Latest research and explanation on how semi-supervised learning is performing better than supervised?

So in AAAI 2020 also semi-supervised learning is given the push. There are some intuitive reasoning provided by people but since the research is so fast, I wanted to know actually what is the latest theoretical, intuitive reasoning which gives more emphasis on semi-supervised learning and what is the modern consensus by researchers on this approach ( meaning that it is just a hype or this approach can actually yeild results ).

Some pointers or resources to it will be appreciated.