yes, there are advantages of eating your fruit unprocessed regarding for example heat sensitive nutrients like vitamin c and b-vitamins.
however, the content of fibre, minerals and heat resistant vitamins (like vitamin e) is not affected substantially by pasteurization. if you want to vary your fruit consumption and be able to buy a smoothie in a store, pasteurization is rather an advantage.
when fruit is mixed, like juices and the fruits in froosh smoothies, substances that destroy for example vitamin c are released. if the smoothie or juice is not consumed on the spot, the vitamin c content will degrade.
however, if the smoothie is heat treated, these substances are inactivated, and the vitamin c degrading action stops. (this is true for polyphenols – certain antioxidants – as well, but this is not allowed to publish according to the eu regulation.)
in addition, the heat destroys bacteria that otherwise may grow and make the smoothie bad after storage. so in short, the heat treatment is a means to preserve the smoothies without using any preservatives.