What are your thoughts on this video and the technique?

Importance of the Pickling Technique in Harsh Climates
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It’s interesting how the Scandinavian regions share cooking methods, proteins, and specific starches. Consuming high levels of calories in these climates is obviously important. Food preservation is also a common technique. Check out this awesome video on pickled herring by
Chef Lars:
What are your thoughts on this video and the technique? Have you ever tried it? More importantly, why do you think preserving proteins is so important to these cultures?