Another usecase for sections can be formula-fields...

<$section title="bar"/>
<$list filter="[let: (fieldA + fieldB) * (1 + fieldC) / 100[]]"/>
<$section>

...so that...

{{foo§§bar}}

...returns some calculated output, thus functionaing like formula fields 
either with respect to a tiddler's fields or as rollup-summary-fields with 
respect to properties of tagging or listed items or entirely arbitrary 
items.

Best wishes, Tobias.

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