Most people presume that it is simply a presentational gimmick - a way of adding a 'premium feel' to the selection - but this comes at a material cost and seems unlikely to be enough justification in its own right.
Although some foiling of biscuits is clearly vanity, the biscuit afficionado prefers the following answer: "flavour migration". Certainly orange creams, mint Creams and the like are more likely to be foil wrapped; and these are the biscuits that have the most intense flavours which are likely to migrate and contaminate the other biscuits in the selection.
Off topic, but it reminds me of my experience of working with a regional brewer in the UK. Yeasts used in brewhouses are all registered and maintained in a central Yeast Bank. Over time within the brewhouse the yeasts mutate as they are used (and if multiple yeasts are used in the same brewhouse, they breed as well) such that periodically the brewer needs to return to the Yeast Bank to refresh the yeast and ensure they are brewing the 'pure' beer for which they are famous. The brewer I was working with had stumbled across one of their most popular brews as a result of accidental breedng and mutation of yeasts in the brewhouse, leading them to register a new yeast strain at the Yeast Bank.
So what does this tell us about Life?
- Sometimes there are practical reasons for apparent aesthetic frippery
- Allowing intermingling of cultures can create new and unexpected pleasures
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